In the same bill entry screen in desktop the difference between entering a bill and a vendor credit is a button click at the top. Sounds like you entered a credit instead of a bill – or you entered a negative bill (if even possible)

Open the credit or bill, make […]

Resolution for 'Accounts Rec issue: 'I have an accounts payable bill that is going into Accounts Rec. as a credit' available: Yes.

The Accounts Rec issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the Accounts Rec issue yourself by looking for a resolution described in the article. If it is a complex Accounts Rec issue or you are unable to solve the issue, you may contact us by clicking here or by using other Accounts Rec support options.

For more information about resolving issues related to Accounts Rec in Quickbooks/QBO or to get support for the issue 'I have an accounts payable bill that is going into Accounts Rec. as a credit', click the link below: