sap - RFC callback server not available Exception while trying to execute cl_crm_ducuments=>create with file via RFC -

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i'm trying upload file server directory sap-crm system (as attachment of opportunity). therefore using method create_with_file of cl_crm_documents class.

to call method using rfc-function created myself. if test rfc-function within function builder, works fine. if execute rfc external system (in case ms-outlook) error occurs: "exception: rfc callback server not available".
started debugger , program runs half way through (so connection works): create_with_file calls couple of functions until rfc_start_program function called. error occurs @ line.

does know why error occurs if call function remote , solve problem.

i don't have access crm system, what's happening: class use tries perform action on front-end pc using sap gui. this, performs rfc call or sap gui. works fine long using function builder because there's gui connection available. once use other means invoke function module, gui no longer there , program won't work. i'd suggest check code see whether there parameter or customization allows suppress rfc call...


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