Gas date &1 default value &2: deviation of maximum &3 months

What causes this issue?

The system checks the gas date you enter against the table for gas
allocation data. The date you entered is permissible, but it deviates
too much from the scheduled meter reading date.

System Response

How to fix this error?

Check your entry. If you do not want to change the gas date, then
adjust the table.

Error message extract from SAP system. Copyright SAP SE.