Invoice issue in SRM 7.0 After Approval Process & IDOC Generation

Hi Experts,

I am working on a issue in SRM 7.0 (Extended Classic Scenario) where we create Invoices in SRM and after approval it goes to Backend with the help of IDOC's.

In some of the cases even after all Approval , Invoice's are in Awaiting Approval status ( at SRM Portal) as well there are no IDOC's getting created.

Q : From which FM or Table I can use to fetch the details about the status of invoice Document.

Q : If I will get the status as Awaiting Approval in table or FM result then Can I use FM BBP_PD_INV_STATUS_CHANGE to change the status?

Q : If this FM works fine to change the status then will SAP standard will take care further to create an IDOC and post it or I have to do it manually using FM BBP_PROCDOC_TRANSFER.

Regards

Devraj