During your sync operation, you receive an invalid property on an entity. The ‘XXX’ attribute of your Transformed file is invalid on target application, which is Shopify here.

Cause

There might be a number of reasons for this error:
a. The property is mistakenly created during transformation, and you don’t need it to be present in Target application.
b. The property is created from pre-packaged template, and you don’t know what to do with it.
c. The property is mapped correctly, but field is not present on SAP B1. 

Resolution

To resolve this issue, follow the links below for reference.
a. How to disable invalid mapping on transformation
b. Refer to SAP B1 SDK to ensure all the fields are correctly mapped
c. How to create UDFs through extension
d. How to create user defined field in SAP B1