user defined relationship type (BINRELTYP)

Question: Hi,
we are creating via document flow between two activities using 'VONA' inter-linkage relationship type (BINRELTYP). However, we need more specific relationship: Instead of 'preceding/next document', role text should be 'created automatically', for example.

(The document flow is created automatically using 'BAPI_ACTIVITYCRM_CREATE' and other function modules).

Is it possible to create user-defined relationship type?

Answer:
Anyone?
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