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The posting groups are defined in Financing product card and can be edited in calculation status in Financing Contract Card or Financing product card. It means that every loan could be posted to different G/L accounts according to filled Posting groups in Financing Contract Card.
Check the Example example of the Posting Setupposting setup bellow.
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Posting Groups
The posting groups map entities such as customers, vendors, items, resources, and sales and purchase documents to general ledger accounts. It saves time and helps avoid mistakes when you post transactions. The transaction values go to the accounts specified in the posting group for that particular entity. The only requirement is that you have a chart of accounts. More details here.
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Posting contract repayment from 1.11.2022:
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How to create calculation in general
How to create reminder in general