Capturing additional information(DFF) at receipt page

Summary:

Hi, at receipt page we have consumed all the provided attributes at AR_CASH_RECEIPTS FLEX FILEDS which is 15 but want to capture few more additional information's but while creating the DFF's i am not getting any table column for attribute. Is we have a limit of 15 attributes only at receipt page, and how can i capture additional info after 15 attributes

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