Phase &, proc. instruction &: Error in formula &

What causes this issue?

The process instruction &V2& for phase &V1& of the process order is a
process data calculation formula. However, the formula defined for the
calculation contains an error. For this reason, the desired value
cannot be calculated.

System Response

In the calculation log, the message currently selected is succeded by
another message containing more detailed information on the error.

How to fix this error?

RESET N1
Read the next message in the log to obtain more detailed information
about the error.
You can correct the error in the following ways:

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

<ZH>In the case of PI sheets with test function:</>
Correct the definition of the formula in process instruction &V2& for
phase &V1& of the process order.
Create a new control recipe and maintain the corresponding PI sheet.
<ZH>In the case of productive PI sheets:</>
Errors in the process instruction cannot be corrected for the current
PI sheet.
If necessary, deactivate the process instruction in the PI sheet.
Manually calculate the value.
Manually create the process message to be used for reporting the value.
<DS:TRAN.CO57>Create message</>
INCLUDE 'NA_PLNREZ_HINW' OBJECT DOKU ID TX LANGUAGE E
<DS:TRAN.C202>Change master recipe</>

Error message extract from SAP system. Copyright SAP SE.