It seems Sage Intacct's Legacy API, which our Connectors use by default, does not accept querying the CUSTAGINGHEADER (Customer aging header) object. The Legacy API uses the inspect function when retrieving your data and it does not seem to be supported here.

To resolve this issue, you will want to use Sage Intacct's newer API instead. You can do so by setting the UseLegacy connection property to false. After doing so, our Connector will use the lookup function for the CUSTAGINGHEADER object, which will successfully return your data.