How To Fix VV503 - Planning material & is locked (assignment check not possible)

SAP Error Message - Details

• Message type: E = Error

• Message class: VV - Requirements and availability

• Message number: 503

• Message text: Planning material & is locked (assignment check not possible)

What causes this issue?

The <GL:planning_material>planning material</> &V1& (plant &V2&)
belonging to material &V4& which you are processing is blocked by user
&V3&. The system has attempted several times without success to block
this material.

System Response

So as not to slow your work, the system stops its attempts at blocking
and does not carry out an assignment check.

How to fix this error?

Note that the transaction you are processing is not confirmed. You
should therefore carry out another assignment check
<DS:GLOS.availability_check>(availability check)</>.

Error message extract from SAP system. Copyright SAP SE.