view selector in DI API AR credit memo template

Dear All Gurus/Experts,

II have two problems as follows:

1.

I don't know the doctype code for service AR credit memo to put it in its header template

although I've tried hard to find it using SAP Notes and manual files (UI_SG pdf files, help files, etc. I have simulated like dt_Service, dDocument_Service, ddot_Service, dot_Service but unsucceed.

2.

Is it possible to import some data of service AR credit memo header and line using DI API ?

I appreciate your answer so much. TIA

Rgds,