The oid_gentext_source function returns the object identifier of the source element that was used in #CONTENT to create the generated text object specified by oid. If oid is not a generated text OID or is not from #CONTENT, oid_gentext_source returns oid_null().

The oid_gentext_source function is intended to be called from functions that are called as a result of the attloc=system-func FOSI setting.