Service PO Invoice posting through BAPI

Question

Hi Gurus,
Please help me to resolve the issue explained below:
We are using a third party tool for scanning incoming invoices from vendor.The scanned invoice details pass though SAP Interface and with the help of standard BAPI_INCOMINGINVOICE_CREATE in SAP ECC, invoices are automatically posted.
Till now , we only had material/Goods PO invoices which use to get posted with quantity blocks before GR done.In future,SAP PM
module will be implemented and service PO invoices will also be posted using this process.We have following issues for posting
of invoices for service items:
1.For service PO Invoice to get posted though BAPI, service entry number is mandatory without which system does not allow to post the invoices that is we can not have quantity blocked invoices if services have not been entered for service items.Even invoices can not be parked without service entry sheet no. for service items using BAPI.Please advise how this scenario can be handled.
2.Second scenario is that if a particular service line has multiple service entry sheet numbers then which service entry sheet number should system use to post the invoice?
Kindly advise.
Thanks & Regards,
Niti

Answer 1

Dear Vipin,
May I assume the following scenario. When you post an invoice manually and there's a small difference between the vendor amount and the total of the suggested amounts on items (plus VAT), you just adjust one of the items or enter unplanned delivery costs and this way avoid the disbalance.
However, when you post the invoice automatically through BAPI, no such adjustment is made and the system tries to post the difference to the account defined behind the account key DIF. For this posting the system shall assign a tax code. One way to define this code is to assign the default tax codes in IMG for IV -> Incoming Invoice -> Maintain Default Values for Tax Codes.
Or just make sure you define all the item amounts explicitly in the BAPI and there's no disbalance.
BR
Raf