In the Sales and marketing parameters in D365 FO, set the Opportunities parameters to 'Never'.

If the integration between D365 FO and Rental Management for D365 Sales is active, opportunities are managed in Rental Management for D365 Sales. So, it is not desirable that opportunities are created in D365 FO.

If not set to 'Never', on synchronization of (project) rental quotations from Rental Management for D365 Sales to D365 FO, an error message is shown.

Standard procedure

1.	Go to Sales and marketing > Setup > Sales and marketing parameters.
2.	On the General tab, set all Opportunities parameters to 'Never'.