Solution: This is most likely a permissions issue. The resolution is to verify that the web services user (the user that "owns" the Sage Intacct connection in Expensify) has "Read-Only" permissions to the Accounts Receivable module in Sage Intacct.
To do that, go to Company > Users > Subscriptions (for the web services user) > Permissions (for AR) > select the Read Only radio button option > Save. Then sync the Sage Intacct connection in Expensify (Settings > Policies > [Policy Name] > Connections > Sync Now).
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