When trying to receive some goods you can come across the error message as shown below in text or in the screenshot above here. There are a couple of possible reasons for this error message to appear. You have entered a date that is not in a open GL (General ledger) period, also known as a accounting period. It can be that you have made a mistake by entering the date, the second is that the date is correct however the period is not yet opened.
APP-PO-14376: Please enter a GL Date within an open purchasing period.
Cause: You provided a GL date that is not within an open purchasing period.
Action: Enter a date that is within an open period.
Or use the Control Purchasing Periods window to open the period corresponding to the date you entered. If you're using encumbrance/budgetary control, also open the GL period in the Open and Close Periods window.
If the date you entered is a valid date and the period is still closed you will have to open Purchasing GL period. You can do so via the Purchasing Super User responsibility. From here go to Setup - Financials - Accounting - Open and Close periods. You will be able to open or close a GL periode. After this is done you should be able to receive goods without any error message.