Only pipeline mvmts for material type & are possible

What causes this issue?

The material you entered is assigned to the material type &V1&.
This material type has been defined as a pipeline material type. This
means that only goods movements with the special stock indicator "P" are
allowed.

System Response

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

How to fix this error?

INCLUDE NA_EINGABE_PRUEFEN
Terminate processing and enter the movement using the special stock
indicator "P".
IF &[SWITCH]S4H_DOCU_ON_PREMISE& = 'X'.
If the material type is not only to be used for
<DS:GLOS.3526C026AFAB52B9E10000009B38F974>pipeline materials</>, change
the characteristics of the material type in Customizing.
ENDIF.

Error message extract from SAP system. Copyright SAP SE.