How To Fix VV156 - Priority for 'document number' must be higher than for 'document item'

SAP Error Message - Details

• Message type: E = Error

• Message class: VV - Requirements and availability

• Message number: 156

• Message text: Priority for 'document number' must be higher than for 'document item'

What causes this issue?

While evaluating the sorting criteria for rescheduling, you have
evaluated 'document item' higher than 'document number'.

System Response

Sorting is not allowed.

How to fix this error?

Allocate a higher priority for 'document number' as for 'document
item', where '1' is the highest priority and '5' is the lowest.

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.