Sorry. That is not the one. ETENR is of NUMC 4. But the field I am seeing is atleat 8 characters (maybe 10).
I dont have any further information than the name given :
Delivery Schedule Number or Delivery Plan Number field.
I can further say to you that this is being used in Vendor Decleration
Are you looking for Inbound Delivery Number ( for a Purchase order ) . This is LIKP-VBELN. LIKP table stores data for inbound delivery against a PO as well as outbound delivery against a sales order . Also what do you mean by "Vendor Declaration" .. is it "Vendor Creation" .
If you are looking for Scheduling Agreement Number it is EKKO-EBELN.