Function module / method to copy pricing conditions between contracts

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Hi,

Is there any function module / method to copy the pricing conditions from one contract to another (WB21), i have tried to use several but non of them are working. My problem is when i have 2 lines in the contract A and i am creating corresponding trading contracts for each line of master contract so

Contract A - Item 10 will have new contract - Contract A1 - Item 10

Contract A - item 20 will have new contract - Contract A2 - item 20

But the problem is when some one changed the item 10 in the contract A then contract A1 - item 10 should be updated with the latest pricing conditions but unfortunately item 20 also updating with line item 10 of Contract A...

present function module is not taking care about proper pricing conditions copy, it was always updating all the corresponding contracts even if we change Contract A - Item 10. Not sure whats wrong, so if i have separate function module / method to update the pricing conditions from one contract to another it will be great.

Thanks