Symptom
You have a requirement to update the Payment Method and also set the Mainbankindicator as true for Employee using Webservice. But none of the combination in the request payload is helping to make the required change
Environment
SAP Business bydesign
Reproducing the Issue
Web Service - EmployeeDataBundleMaintainRequest / Employee Data / Manage Employee Data / Manage Personnel Administartion Data
Cause
Cause for the issue that there is no Identity XML tags in your payload which actuall allows consistent delivery of Bank Details.
Resolution
You need to change the Action Code to allow an update of the Bank Details and include the Identification tags to achieve the requirement
Below is a sample for identity XML tag in the request payload
Keywords
payment method, bank details, mainbankindicator, employee , KBA , SRD-HR-PAD , Personnel Administration , Problem