Link between Service Call and Marketing documents not working

Question

Hello all,
I found a field in Marketing Documents - Rows data - that should be the link between a Service Call and the Marketing Documents.
The field is for example "INV1.isSrvCall" but, even if I create an Invoice from the Service Call, the field will be populated with the value "N".
Dows anyone knows how to make this field work? Or any workarround to make the connection between a Service Call and the generated documents?
Thanks in advance,
Kind Regards

Answer 1

The problem with SCL4  is that SAP updates it way too late in the process to be meaningful while in the module. You create a service order, then go into the expense document. That is when we need to know the service call id and the internalsn of the equipment being worked on Only when you get out of the service module do SAP post to SCL4.  
The data (before writing to SCL$) exists as a veriable on the original service form.  But can we access it from the expense document?
The question is how to access the data (service id) on the original service form from an expense document within the servide module. It is the service form, and that is currently not in focus, so I do not know if you can access it as a varaible, while in the expense document (sales order or invoice) that is in focus.
Can any one help with this/
David