In MDM studio, to send data from a source company to a target company, Connectivity studio messages are used. You define the applicable messages on a master data entity or on the related hierarchy messages.

When you import master data entities into another D365 F&SCM environment, ensure that the related Connectivity studio messages already exist.

So, when you export master data entities, ensure to export the related Connectivity studio messages as well.

For more information, refer to Export Connectivity studio configuration.