Hi Naveen K.
Thank you very much for your reply! I just found standard fields for billing period at item level in the billing document and I think it makes sense to keep them at item level, because if in any case the customer generates one invoice for multiple line items in the contract on the same billing date, there is still chance that each item may have different billing period.
The customer may consider to add billing period info into item description in the billing document, do you know which bapi I could use to put the z-logic in, by the time billing document is created?
And as you mentioned if we just want to change the output, e.g. if we want to pull billing period info into desciption field by the time output is generated, should the z-logic be put into the Smartform / EDI part?
Many thanks for your reply.
Best regards,
Ellie