The user can register the counter reading directly from the Work Order page.
Created reading is added automatically to this Work Order.
The date of the reading is added automatically (can be changed).
This is the date of the last reading (if the posting date of the WO is before the last reading), or this date is the posting date of the WO (if the last reading was done before the WO posting date).
Then the user is closing the Work Order - he has a possibility to register counter reading directly from the closing page.