There is only one key date allowed for selection here

What causes this issue?

Only one key date is allowed for the selection of funds centers.
You have not entered the key date as a single value without a selection
option (or with mit selection option '=').

System Response

Selection was not executed.

How to fix this error?

If you want to define a key date for selection, you must enter this key
date as a single value without a selection option (or with selection
option '=')

Error message extract from SAP system. Copyright SAP SE.