Error importing entities from Thingworx7.3 to 7.4
When importing entities exported from Thingworx 7.3 (both Binary and XML) i get the error, 'Error Importing, Not Acceptable'
Any idea why this is or how to get around it? It would be a real problem to recreate what I've already done from scratch.
The versions I am using are:
Thingworx 7.3 PostgreSQL
Thingworx 7.4 MSSQL
As always, any help appreciated.

