This checkbox is enabled only if closing sub ledgers and you unchecked the All Others sub ledgers box.
Check this box to close the sub ledgers for Accounts Receivable. Checking this box will restrict posting in AR, as well as batches created in other modules containing AR transactions (JB Progress Billing, JB T&M Bill Init, JB Interface, JB Batch Process, MS Invoice Edit, MS Invoice Initialize, and IM uploads of AR transaction data).
Leave this box unchecked if you are not closing AR at this time.
For related information, see About the GL Month End Close Form.