The quantity table contains an entry with an invalid unit of measure

What causes this issue?

The Quantity Conversion Interface (QCI) calculates a set of target
quantities based on a source quantity and source UoM and a set of
quantity conversion parameters (density, heating value, reference
pressures and temperatures) for a given list of target units of
measure. Before the calculation can take place, the set of target UoM is
checked. This check failed, since at least one of the target UoM in the
internal table is not defined .

System Response

The system stops processing.

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

The problem is caused by an incorrect call of function
OIB_QCI_QUANTITY_CONTROL. Note the transaction or process for which the
error occurs and either change your program or contact SAP if the error
occurs in a standard SAP program.

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.