Implement BAdI "WDSD_BADI_SALES_PRICE_CALC" to use this function

What causes this issue?

You must implement the BAdI WDSD_BADI_SALES_PRICE_CALC to perform a
customer-specific sales price calculation.

System Response

You have not implemented this BAdI, so the system cannot perform a
customer-specific sales price calculation.

How to fix this error?

Implement method CALCULATE_SALES_PRICE of this BAdI.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.