Stock check error message in serial numbers problem

Question

Dear Experts,
In serial number profiles i did the stock check indicator to give an error message if there were incosistinces in stock data,
now this is the scenario:
after doing an external maintenance order and creating a PO with reference to the maintenance order PR, and also entering the specified serial number in the PO:
1) Goods Issuing: i used MB1B with movement type 541 and as the serial number already exist and not wrong so it didnt show any error messages and by checking the stock data in MMBE the material was in stock provided to vendor.
2) Goods Receipt: when using MB01 with movement type 101 and when entering the serial number of the material it gives an error message ALTHOUGH it is the same serial number issued and the same serial number in the PO
This is the error message :
Stock data of serial number G081 not suitable for movement
Message no. IO231
Diagnosis
The current stock information for the serial number G081 contradicts the stock information of the movement to be posted. The following stock information is valid for the document and the serial number:               Batch Number Stock data Serial data   C2
Only the first different field for the stock data/serial data is assigned. However, further data may also be inconsistent. To determine whether this is the case, you can start an analysis.
System Response
Two system responses are possible (set using Customizing): If the case of an error occurring, the assignment of the serial number to this posting procedure is not possible. In the case of a warning, you can, if necessary, transfer the notification.
Procedure
Assign a serial number which corresponds in your stock information to the stock data of the posting. You can display the serial numbers which can be used using Select serial numbers.
Any help is appreciated
Thanks in advance

Answer 1

Try with MB04 t-code.
And External Operation scenario is as follows:
External Operations will be defined in Maintenance Order with control key PM02. There price will be maintained. So based on that, PR will be created for the External operations. Convert to PO & do GR for operations. I guess, here we can't do any goods issue of material to sub-contractor.
The reason is that in Sub-contracting, issue item & receiving item should be different. It can't be same. But here in our case, material code & serial number are same.
So try this process.
Check the below link for External Processing.
http://help.sap.com/saphelp_erp60_sp/helpdata/en/5b/ae48624b8611d182ba0000e829fbfe/frameset.htm