BAPI - example

Hi All,

I have a PDM system where all BOms are designed and a ERP system. Boms are created at PDM level are moved to ERP on regular basis with the help of an IDOC.

Before posting Data i need to verfiy few validations for the ERP system from PDM system. Basically, i have to retrive ERP systems Data at PDM system to do some validations.

I understand taht RFC or BAPI's can help in this regard.

Can any one suggest more on this. May be a existing Example in SAP ?

Thanks and Regards,

Manohar