If a record fails to save but displays no error message then check the fields on the tab that is highlighted with a red exclamation mark. Check that the field lengths are correct by doing the following:
Log in to CRM as an Admin User
In the top right, click the User icon, and select Admin
Under Developer Tools, click the Studio option
Click the module this record is part of
Click the Fields option
Identify the fields displayed on that tab
Check the Max Size option to make sure this accommodates the data for this field
Make any changes to this as required
Click Save
Another option to check is Required Fields. It is possible a field that is populated via your integration (e.g from Dimensions) is a required field within CRM but has not been filled in properly via Dimensions.
A common occurence on this is missing lines in either Billing or Shipping Address, the fixes here would be to either populate the information correctly in Dimensions, or to remove the required field tab in studio. If you need assistance removing the required field, navigate to the field in studio detailed 'here' .
If none of the above applies then check any calculated fields (such as percentage/revenue) have been created as Integers instead of Decimals. It could be the attempted calculation is trying to return a decimal and the integer field will not allow it. If this is the case edit the formula as per the following:
round([insert current formula here],0)