Updating Contacts give this error, Sage Accounting API

SUGGESTED

Hi,

Im triying to update Contacts using the API and Im getting the next error:

"validation" : { "errors" : [ "field" : "tax_number", "message" : "must be blank" },

"field" : "tax_number", "message" : "Format must match '123456789XX1234 (15 characters)' for country Canada." }

Any idea what is the issue, I cant really find anything specific for this type of error.

Thanks!!!