Invalid working status

What causes this issue?

An invalid working status (technical field CNTRL-WKSTA) has been passed
to the function module OIB_QCI_QUANTITY_CONTROL.

System Response

Error. Processing cannot continue.

How to fix this error?

Contact your system administrator if this error happens while the system
is used in production.
If you encounter this error when calling the QCI from a customer's own
program during development, note the following:
Send a valid working status to the function module.
1 = Calculate document line item quantity in additional units of
measure. This is used for creating a new document by all transactions.
2 = Change document line item quantity, or create with a reference.This
is used where the transaction quantity is allowed to be changed within
the "calling" transaction (only classic transactions using dialog pop-up
box).
3 = Change/display calculated quantities. This is used for displaying
the quantities already calculated, and if allowed, recalculating the
quantities (only classic transactions using dialog pop-up box).
4 = Display/change material document transactions. This is used when the
transaction quantity cannot be changed (that is, for a document
reversal, or display of a document within classic transactions using
dialog pop-up box).
5 = Desktop Calculator. Unrestricted functionality for calculating
quantities without posting a transaction within the system ( obsolete,
replaced by new transaction O3QCITEST using a working status of 1 ) .

Error message extract from SAP system. Copyright SAP SE.