Thank you so much Grigoriy and its really helped me alot.
I have some more open queries around this.
1) Can we restrict user not to post greaterthan the credit line ?
2) May i know the impact of settlement? Why do we need to do it? I don't see in change/message post execution of settlement.
3) System doesn't post accounting documents or not showing any output in t.code-TBB1 for facility( product type-56B) or interest instrument (product type-55A).what time books will be updated?
Thank you once again.