Open transaction SE91 and enter message class M8, click display and scroll through the entries.
SAP has grouped the messages and has entered a message that just describes the section, like message 469 which has the description
******** 470-499 reserved for Batch IV **********************************
if you select the message and click the where used button you will be taken to the programs where they are processed, in this case they are all going to function module MRM_AMOUNT_CHECK
If you can read German then you can see from the comments what checks are done, otherwise you need to understand ABAP
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