Order &1, operation &2: resource differs from approved recipe

What causes this issue?

You have created a process order that requires approval for an approved
recipe. A resource has, however, been assigned to an operation that is
not assigned in the master recipe. This may happen, for example, if the
operation had already been scheduled at a different resource in the
planned order. When you convert the planned order to a process order,
the scheduled resource is retained but recorded as a deviation from the
recipe.

System Response

The system withdraws the approval for the process order.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.