Before making selection, position cursor on a discount

What causes this issue?

You have executed the <LS>Choose</> function, but you have not
positioned the cursor on an entry that can be selected.

System Response

How to fix this error?

Position the cursor on the fields <LS>Discount</>, <LS>Discount price
</>, <LS>Discount percent</>, <LS>Discount quantity</> or <LS>Discount
description</>, and double-click these fields.

Error message extract from SAP system. Copyright SAP SE.