Count date must match inventory data & or not fix book balance

What causes this issue?

The inventory count date you entered is different than the planned
inventory count date.
IF &[SWITCH]S4H_DOCU_ON_PREMISE& = 'X'.

System Response

The system does not allow you to enter a different count date, so that
the function 'Fix Book Inventory Balance' can work properly if you have
activated 'Post Back to Previous Period' in Customizing.
ENDIF.

How to fix this error?

You must adjust the count date to the planned count date. Alternatively,
you can reset the 'Fix Book Inventory Balance' indicator in the
inventory document header.

Error message extract from SAP system. Copyright SAP SE.