Day & is outside cycle length &

What causes this issue?

You attempted to expand your shift sequence and have exceeded the cycle
duration.

System Response

The system only accepts cycles of 1 or 7 days. Therefore, if you expand
your shift sequence, you can only enter a day with the number 1 or with
a number from 1 to 7.

How to fix this error?

Enter a day within your cycle.

Error message extract from SAP system. Copyright SAP SE.