I encountered several cases that components are assigned to the wrong operation (usually the first operation) eg. 0010 when creating a production order/process order although the component is assigned to another operation eg. 0030 in routing or master recipe.
I summarize all of the cases I encountered and hope they can be helpful if you got the same problem:
Case 1. Components of phantom assemblies are involved.
Have a look at the note 156366. The field PLMZ-KANTE and PLMZ-STLNR_W might be filled incorrectly if your system is upgraded or migrated from an old release like 3.1H. Let me take a small example which shows how the 2 fields are filled.
BOM structure:
PP_FERT
|
PP_HALB PP_HALB_PHAN (phantom assembly)
|
PP_RAW1 PP_RAW2
Component allocation in CA02:
| Component | Operation |
|---|---|
| PP_HALB | 0020 |
| PP_HALB_PHAN | 0020 |
| PP_RAW1 | 0030 |
| PP_RAW2 | not assigned |
Result in table PLMZ:
If you have similar BOMs as in my example and find the field PLMZ-KANTE is empty, you can refer to the note 156366. If you only have one routing with this problem, you can try to delete the component allocations in CA02 and assign them again. The field PLMZ-KANTE should be filled correctly by deletion and reassignment. If you have too many routings with this problem, the report ZBKANTE in note 156366 can be used to correct them.
Case 2. Alternative items are involved
Alternative items in the BOM should be always assigned to the same operation in the routing. Otherwise, you may get wrong component allocation results when creating a order. KBA 2086778 explains it in more details.
Case 3. If multiple BOM alternatives have been maintained and one of the BOM alternatives is named as 'M'
Check if Note 2283128 is implemented on your system. This note corrects a system bug in this case.
Other cases.
Firstly make sure the right routing is selected. You may have defined many routing group counters for the same material. They could have the wrong component allocation.
Secondly try to delete the component allocations and reassign them if it's possible.
Thirdly check if there really is an entry in table PLMZ for the corresponding BOM item. The table relationship is described in this document:
When deletion indicator is set in routing tables PLPO/PLAS/PLFL/PLMZ
At last if components are still assigned to the wrong operations, contact SAP Product Support by reporting an incident in component PP-SFC-PLN-CPT or PP-BD-RTG.