Resolution

By design, only one unposted adjustment can exist at a time for a bill.
Utilize the following guide to find the unposted adjustment that is preventing a new adjustment from being created: Find Unposted Accounts Receivable Adjustments
If the unposted adjustment found using the above guide is in Bill Detail Adjustments, use the following to post it: Find and Post an Unposted Bill Detail Adjustments Batch
If the adjustment cannot be found or cannot be posted, please contact Tax Support for the appropriate region.

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