This post explains how to add custom fields to opportunity products, quote lines, order lines, and invoice lines in Dynamics 365. The post also explains how to maintain the mappings between these tables using XRMServices to return the unique ID of the required relationship in the environment. The post provides three links that return the ID for each of the relationships, and once you have the entity map set GUID, you can manage your mappings. The post also includes screenshots of the output and the type of screen you should obtain when you open the link in a browser.
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