The Access Capture integration uses a Broker Service and Mapping configuration to send invoice data to mapped fields in Dimensions. To set Approver 1 with a specific User ID, both of the following must be true:
Using Dimensions only for Invoice Register Approver.
Have the correct Invoice Register settings applicable for either PL Approval or POP Approval within Dimensions Invoice Register settings.
If you use Access Approve or FocalPoint for PIR approval, it may not be possible to set a specific Approver 1 field as the setup does not support this. If you want to explore options, additional consultancy work may be required to customise the integration. Contact your Account Manager to discuss further.