Sales tax data does not define input tax

What causes this issue?

In Customizing of the <DS:SIMG.REFXV_TIVCNCCTADD>contract type</>, the
setting in the <DS:DE.RECNUSERSUPPLIER>user/offerer</> field
specifies whether this is a customer contract (company code is the
offerer) or a vendor contract (company code is the user). Depending on
this setting, the posting term expects output tax (customer contract)
or input tax (vendor contract) as sales-tax data.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Switch to the processing of posting terms to correct the error.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.