3699535 - Supplier Invoice is Posted Even Though the Mandatory Extension Field is not Maintained

Supplier invoice is posted while the extension field is not fulfilled, even though it is mandatory. 

SAP Business ByDesign

1. Go to Supplier Invoicing work center.
2. Go to Invoices and Credit Memos view.
3. Search for ABC (ABC is the Invoice's ID). 
4. Click in Edit button. 
5. Navigate to General tab. 

The mandatory extension field XYZ is blank (not maintained). 

How could this invoice be posted with a mandatory field not maintained? 

This supplier invoice was created either via Web Service or Invoice Scanning tool. 

When invoice is created in those two methods, the system runs a standard payload in which this extension field is not mandatory (so it is set as optional). 

For invoices created via Web Service, please use a customized Web Service in which the Extension Field XYZ is mandatory in the payload. 

For scanned invoices, please maintain the "Invoice Scanning Extension Scanario" in the Extension Scenario configuration. 

Supplier Invoice, Mandatory extension field, Scanned supplier invoice, Web Service, Payload  , KBA , SRD-SRM-SI , Supplier Invoicing , How To