Channel Batch Transaction import failing for Supplier Invoice with custom qualifier value

Created custom qualifier for supplier rebates to achieve one of our clients requirement , to generate the accruals with that qualifier tried loading Channel Batch transaction import by providing attribute category code as DFF context code and attributechar1 with value belongs to that context.
Example : Attribute Category code : Supplier_Region_headerdff
AttributeChar1 : US State
After importing the CSV template getting below error. Please guide us if CSV template can be loaded with the custom qualifier values , if so then what are the expected values to be provided.

Error : You must enter a valid value for the Header DFF attribute. (CJM-6135007)

Note : Also to be noted that previously this was being tested for customer rebates with custom qualifiers and we got the similar kind of error.