The function is assigned to a processing code (WE41). This processing code appears then again in the out bound partner agreement (WE20), when you link the profile to a NAST message.
For master data, that is not triggered via NAST but processes change pointers, the function is called explicitly from the job that processes the change docs. (see MASTERIDOC_DISTRIBUTE and e.g. MASTERIDOC_CREATE_MATMAS or MASTERIDOC_CREATE_ALEREQ)
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