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IDoc message type MBGMCR
From SAP Knowledge Base
If a partner has carried out a goods movement or wants to transmit the goods movement for your system, this message type is suitable.
General
Message Type: MBGMCR
Base type: MBGMCR0X (X = you should check, if there is a newer one available)
Direction: In & Out
Creation: Output IDoc
BAdI Usage
BAdI: MB_DOCUMENT_BADI
Method: MB_DOCUMENT_BEFORE_UPDATE
In the method, the FM MASTER_IDOC_DISTRIBUTE can be used to generate the output IDoc.