Performance-based maintenance start counter reading

Hi experts, i need your help to schedule performance-based maintenance plan.

I want to make a strategy maintenance plan which follow the actual running hour and the first order is released

after 3months from now. So, i input the start counter reading as below. Because current counter reading is 0,

and i expect the running hour after 3 months is about 1560 hours.

But the error occurred as screenshot. ("Entered counter reading greater than last entered counter reading").

How can i make the first order to be released after 3months from now ?

Please advise me.

Thank you !