BPM Approval workflow attribute for amount change while PO creation

Summary:

we have a scenario where buyer can change the amount on PO line while adding PR line to document builder.

If buyer increased the amount, based on amount employee hierarchy with multiple job levels will be followed

example: PR line amount is 10000$
amount increased is 5000$ on PO line and amount is 15000$
it should follow L1 rule where amount between 1 and 10000$. since change amount is 5000$

we don't find any BPM attribute which captures this change amount. we just found only RequisitionAmount.PercentExceeded attribute which gives percent only.

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