No document number could be assigned

What causes this issue?

No number range interval is assigned to transaction/event type <NP>MY</>
.

System Response

Processing is terminated.

How to fix this error?

IF &[SWITCH]S4H_DOCU_CLOUD& = 'X'.
Contact your system administrator.
ENDIF.
IF &[SWITCH]S4H_DOCU_ON_PREMISE& = 'X'.
Assign a number range interval to transaction/event type <NP>MY</>. To
do this, in Customizing for <LS>Controlling</>, under <LS>Product Cost
Controlling -> Actual Costing/Material Ledger ->
<DS:SIMG.SIMG_CFMENUOLMWOMX4>Maintain Number Ranges for Material Ledger
Documents</></>, maintain number range object <NP>ML-BELEG</>. Create a
new group with the name <LS>Delta Posting for Balance Sheet Valuation
</>. We recommend that you use the number range interval 8000000000 to
8999999999, provided that this is not yet assigned.
Then assign transaction/event type <NP>MY</> (element <NP>MY</>) to the
new group.
ENDIF.

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.