Disposable assembly
Description
With this module, the complete structure of a parts list - i.e. including the structures of all subordinate assemblies - can be changed in a production part role in order to better reflect the actual manufacturing process of the part in production.
In design, assemblies are often only formed from a purely functional point of view, i.e. a "constructive" product structure is created which does not correspond to the "dispositive" product structure. Such deviations between the "constructive" and "dispositive" view of a bill of material can occur when a bill of material
- individual items within a subordinate assembly of this parts list are not first pre-assembled to this assembly in the production process, but are built directly into the higher-level assembly in one go(constructive assembly),
- individual items of the same level do not flow simultaneously, but at different times into different, higher-level(MRP-extended) assemblies (e.g. in the case of subordinate, individually loose parts that must first be provided for final assembly),
- or individual items are only prefabricated as sub-assemblies - not provided for by the design -(purely disposable assemblies).
So if an assembly is declared as a so-called"constructive assembly" on the production part, this level is completely omitted in the MRP view of each higher-level assembly of this production part. If a "dispositive assembly" is declared on the production part, then items from different, subordinate assemblies can be "shifted dispositively (up)" into this assembly, i.e. the vertical range of manufacture of these items can be reduced. Finally, by defining a"purely dispositive assembly", individual items from any structure depth of the parts list can be combined to form a new part, a new assembly.
The constructive product structure of a production part, which is built up from the point of view of design, can therefore differ considerably from the production-oriented dispositive product structure of the same production part, which also changes the structure of the part requirement.
The restructuring of a product structure from the constructive to the dispositive type is defined on the basis of dispositive assembly objects which are added to a production role of a part.
Functionality
Input window
An MRP assembly always refers to the production part whose MRP product structure is to be changed. If the production part itself does not have its own bill of material, i.e. if it is a purely MRP assembly, a bill of material can be freely specified, otherwise the specifications for the bill of material of the production part apply.
With the button 
the constructive, with the button 
the dispositive product structure can be called up.
If a production roll has a bill of material and if the MRP assembly contains an entry for a part from a subordinate assembly of this bill of material, this part is "pushed" below this production part when the production bill of material is exploded (reduction of the vertical range of manufacture) - according to the new MRP product structure.
This also applies to purely MRP assemblies, the only difference is that in this case the production part itself does not have a bill of material, but this is specified in the purely MRP assembly itself (reduction or increase of the vertical range of manufacture). This purely MRP entry is then visible both in the initial production role (the freely selected parts list) and in the production role of the intermediate part, the purely MRP assembly.
| Symbol | Description |
|---|---|
 | Call up the production part. |
 | Call up the parts list. |
  | Create/edit notes |
Fields
| Field | Description |
|---|---|
| Parts list | Parts list to which the MRP assembly is assigned. This can only be freely selected if you insert a purely MRP assembly, i.e. the production role itself does not have its own bill of material. Showconstructive product structure |
| only valid, if outgoing parts list | If this field is set, then the specifications made here for the MRP assembly only apply to the top BOM node itself, and not to the case where the BOM is used as a sub-assembly. |
| Production part | In case of a purely disposable assembly, this field is blocked and the corresponding - purely disposable - production part is displayed here (which itself does not have its own bill of materials). Otherwise, an entry in this field is only relevant if the BOM is used by several production parts at the same time: for such a case, you can restrict the definition of the MRP assemblies to this production part by specifying a particular production part. |
| Reference quantity | Must be set for a purely disposable assembly, the default value is "1 piece". |
| Positions | Showavailable product structure |
| Insert position | The constructive product structure of the BOM specified above (initial BOM) is displayed, an item marked in the tree can then be dragged into the list of items by holding down the mouse button (Drag&Drop). This position then applies within the MRP product structure as the position of the BOM of the production part and no longer as the position of its original BOM. It is not permitted to drag items from the bill of material of the production part itself (items of the first level of the bill of material) into an MRP assembly, as these are already contained in the assembly. It is also not possible to drag the only item of a bill of material into an MRP assembly if the parent part itself is not a constructive assembly: otherwise the parent part would have no bill of material item at all. |
| Remove item | Selected entries in the list can be removed again with this button. |
Available product structure
The MRP product structure shows how the bill of material is later processed in production, or how the parts are planned or installed.
| Symbol | Description |
|---|---|
| List available assemblies in the parts list |
| Show constructive product structure |
 | Printing a disposable product structure |
The dispositive product structure of the parts list is displayed as a tree. The button in the upper left corner allows you to call up the constructive product structure.
The following symbols are used:
Output node of the parts list 
Part 
Part marked "constructive assembly" (only visible in the constructive product structure, as it is hidden in the MRP product structure.- The constructive assembly can be set in the parts list item or in the production part itself.
Part within or below a constructive assembly: in the dispositive view, such a part has already "wandered up" to the "left" in the structure tree, as the superior constructive assembly(s) is (are) hidden. 
Part that has been "pulled up" from its original structure to "left" in the structure by defining an disposable assembly. In the MRP view, the part is already positioned in its "new" MRP BOM, in the design view, the part is still used within the original design BOM. 
Purely disposable assembly which does not have its own constructive parts list. This symbol is only visible in the MRP product structure, since only there is the additional production or MRP level through an "intermediate", purely MRP assembly 
Part which has already "wandered down" the tree by "interposing" a purely dispositive assembly in the dispositive structure tree one step to the "right". In the design view, this part is only marked as having a lower MRP level than its neighbouring items of the same BOM. 
The part of the bill of material item is invalid.
Constructive product structure
| Symbol | Description |
|---|---|
| List available assemblies in the parts list |
| Show available product structure |
| Printing a disposable product structure |
The constructive product structure of the parts list is displayed as a tree.
The button in the top left corner enables the MRP product structure to be called up (see also the symbols used there).
Disposable assemblies
This window is used to display all the MRP assemblies of a production part and all the MRP assemblies registered in the system.
| Menu item | Description |
|---|---|
| Edit | |
| : list all disposable assemblies | Then lists all the disposable assemblies that have been created in the system |
Related topics
- Index
- Purely dispositive assembly - technical description
- Assembly parts lists incl. dispositive assemblies
Technical Documentation
Dispositive assembly Editing module
Module name
dispobom.mod
Classes
Security
In addition to restricting access rights via the class and its data fields, the module can be restricted in its use via some of the received messages.
| Message | Parameters | Function | Security |
|---|---|---|---|
| EDIT_DISPOSITION_BOM | Calling the module |
| Message | Parameters | Function |
|---|---|---|
;){kind=link}
;){kind=link}
;){kind=link}