You cannot enter a sampling procedure for inspection type &1

What causes this issue?

An inspection with inspection plan or with a material specification has
already been planned for inspection type &v1&.
The sample calculation takes place using the sampling procedure
assigned in these master records or assigned in Customizing.

How to fix this error?

Cancel the sampling procedure &v2& or do not set the indicators for an
inspection with a task list or with a material specification.

Error message extract from SAP system. Copyright SAP SE.