Need to know how Promised Detailed Amount gets calculated in RMCS

Summary:

We have an integration from PPM to RMCS and rev rec done in PPM. Same pushed into RMCS (where in RMCS Contract is already created) we ran all the jobs and got promised detailed amount populated but it is incorrect.

So we would need to understand how Identify Customer Contracts job calculates this Column.

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We want Promised detailed Amount as Extended SSP but didn't get. So please help us how Promised detailed Amount calculates.