3525745 - Field "Withholding Tax Base Amount" cannot be entered manually in app "Create Supplier Invoice"

Field "Withholding Tax Base Amount" is non-editable and cannot be entered manually in app "Create Supplier Invoice", even though the Tax Calculation field in Withholding Tax tab is set as "Manual Tax Base and Amount".

SAP S/4HANA Cloud Public Edition

1. Go to app "Create Supplier Invoice", create supplier invoice for supplier which is subject to withholding tax.
2. Go to Withholding Tax, select option "Manual Tax Base and Amount" for the Tax Calculation field.
3. Only the field "Withholding Tax Amount" is editable. The field "Withholding Tax Base Amount" is greyed out and cannot be edited.

Cause 1: In SSCUI 104225 - "Define Withholding Tax Type for Invoice Posting", the "Inherit Base" flag is set for the withholding tax type. This flag indicates that the withholding tax base amount is set to be the same as the withholding tax amount of another type. So it is not editable in the fiori app "Create Supplier Invoice".

Cause 2: Configuration in the field status group within your accounting account settings. 

For Cause 1: Reset the flag "Inherit Base" for the withholding tax type in SSCUI 104225 - "Define Withholding Tax Type for Invoice Posting". Then the field Withholding Tax Base Amount will be editable and can be entered with a value manually.

For Cause 2: Check as well settings under configuration activity Define Field Status Variants - Taxes 102393 "ZXXX" are currently configured as "Suppress"  This configuration causes the withholding field to be non-editable.

Using the example of Field Status Group - Taxes and the Text field: Enter ZXXX (it's required that custom groups begin with Y or Z). It is needed because Standard Field Status Group is not editable.

1. Choose ZXXX.
2. Select 'Field Status - Taxes '.
3. Withholding Tax Code, Withholding Tax Amounts, EC Tax Data and Gross Incoming tax is checked as "Suppress".
4. Select 'Optional' for the 'Text' field.
5. Save.

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