Unable to update subscription line record for Salesforce-NetSuite import

In general, nlapiSubmitField request is used for the body level field mappings on Salesforce-NetSuite import. But, if you have applied Custom form field in NetSuite import mapping, then perform the following steps to manually set the Ignore mandatory fields value to True: 

Perform the following steps to map:

1. In your integrator.io account, navigate to Salesforce-NetSuite Tile.
2. Click Edit imports.
3. Click Mapping. Select Ignore Mandatory fields under Destination record field (Netsuite).
4. Click gear icon and select Hardcode option.
   
   
5. Select True and save the mappings.
6. Click Save on the Netsuite import page.