Bank guarantee for customers

Hello Experts,

can anyone please share me the complete process of bank guarantee?

I have configuration in fbkp C - G (Customer - guarantee) selected Noted item check box, rel to credit limit check box and posting key comes by default & GL accounts maintained.

In GL master, OIM is maintained.

Created statistical posting in f-38. But unable to clear the noted item in f-28.

Please let me know how to convert the noted item to normal account.