Enter material group, sort string and planned delivery time

What causes this issue?

You did not enter a purchasing info record. You have also not
maintained the fields for the sort string, material group and planned
delivery time.
Note that when you maintain <ZK>one</> of the fields for the sort
string, material group or planned delivery time, you must also maintain
the other two fields if you do not enter a purchasing info record.

How to fix this error?

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

Complete the data for sort string, material group and planned delivery
time
<ZH>or</>
Enter a purchasing info record and a purchasing organization. The other
data (except the cost element) is taken from the purchasing info
record.

Error message extract from SAP system. Copyright SAP SE.