If you can't see it, it wasn't posted.  Look for an error batch.

Hi Sarah Harris after you enter an A/P Invoice into an unposted A/P Invoice Batch under the A/P Invoice Batch List, you can then post that Batch which makes an unpaid invoice present under the Vendor Activity -> Transactions tab for the Vendor.  At this stage there is no payment information anywhere.  If you want to pay this invoice, there are two options:

Manual Entry:  You enter an A/P Payment into an unposted A/P Payment Batch under the A/P Payment Batch List, which contains the amounts you wish to apply against the A/P Invoice you posted earlier (and any other outstanding invoices for one or more vendors). 

Create Payment Batch:  You can generate a batch containing multiple A/P Payments for multiple vendors at once!  Open A/P -> A/P Transactions -> Create Payment Batch -> set the criteria for the list of outstanding A/P invoices you wish to select for payment -> generate a Register to review the Invoices that will be paid -> Create a Payment Batch.  The result will be an unposted Payment batch ready for your review in the A/P Payment Batch List.

Remember, the AP Invoice Batch List and AP Payment Batch Lists are separate.  You can view combined Invoice and Payment information for a Vendor under A/P Vendors -> Vendor Activity.

Not sure if that helps but all the best!