I was able to successfully post FI document through Billing document in SD.
The Problem is encountered when a Sales Order is created
for Credit Card customers.
When the sales order is created the credit card information we are prompted with an error message Payment terms is a required field for G/L Acc so and so...
The payment terms field in the posting key 01 is marked required and the same field for the reconcilation account is optional. However this config has not created any problem for the Non credit card sales orders.
If any one has faced the same problem. Please help me out in this issue.