Here’s how you can correctly show the N:N relationships in sub-grids on the entity forms.
Continue Reading priyeshwagh777’s Article on their blog
Adding N:N Relationships in Sub-grids correctly in Dynamics 365 CRM | [Quick Tip]
If you are new to customizing Dynamics 365 environment and have been creating N:N Relationships between 2 entities and you are not able to add them in the sub-grid.
Blog Syndicated with priyeshwagh777’s Permission
More About This Author

Array
Dyn365CE2023.03.26Resolve Project Operation errors | PSS Error Logs
Dyn365CE2023.03.15Identify deprecated JS code in your Power Platform solution using Solution Checker
Dyn365CE2023.02.22Power Apps Developer Plan environments | Power Platform
Dyn365CE2023.02.08Metadata Browser and Entity Metadata Browser in Dynamics 365 CRM | Managed Solution & XrmToolBox