&1 individual records are missing - read long text

What causes this issue?

&V1& line items could not be created as the chosen daily frequency is
too low to skip a weekend or a series of non-working days if a calender
exists. The program is not able to calculate appropriate planning data
for the following line items.
The last line item created has the planning date &V2&.

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?

Maintain the missing &V1& line items manually in the system.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.