Assigning Item charges manually

Hello All,
I have this customization to be done when we apply the item charges,it should be based on amount to assign field.
Like,If I am selecting the receipt lines from various purchase receipt,we should be able to divide the total unit cost amount by manually entering into the Amount to Assign Field so that Qty. to Assign is validated and updated accordingly.I did some modification but its not working at all.How can I achieve this customization?
Any kinds of help will be appreciated
Thank You
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