Installed Accounts Payable Version 8.1C today and did the the date integrity of Accounts Payable after installation and now we have an error message.
"Orphan GL detail have been found"
Checking transaction GL details ....822 errors found.

All the other data integrity checks were OK

Is this a problem?

The following text can be found in the Release Notes and the ReadMe for the update to Adagio Payable 8.1C (2011.07.29)

Turning on the 'Delete history transactions' option in both the Period End and Year End functions cleared the transactions but did not clear the related details within the Payables GL Distribution Details table, leaving "orphan" records in the table. (Note: the Maintenance | Purge Vendor History function did clear these details.) The orphan records caused an error if you later posted transactions with the same (i.e. a duplicate) document number to a vendor. The Data Integrity Check (DIC) detected and rebuild these errors after a posting. The DIC (in Payables but not DataCare) now detects ALL orphan records and removes them when you do a rebuild so the error will not be repeated with future postings. While the DIC is rebuilding, progress is not shown (the number of orphans deleted is not updated). This may take several minutes. In many cases, the first DIC run after installing 8.1C (2011.07.29) or higher may detect and rebuild a large number of errors caused by the orphan records. This is not a cause for concern.

Posting Manual checks to 1 time vendors caused integrity errors in the GL Distribution Details table. These errors caused no problems and were not reported by the Data Integrity Check (DIC). The DIC (in Payables but not DataCare) now detects and rebuilds these errors. In many cases, the first DIC run after installing 8.1C (2011.07.29) or higher may detect and rebuild a large number of these errors. This is not a cause for concern.

The first one is likely your situation, and this is happening because the errors were there all along, but this version is the first to detect it properly. The solution is to backup your AP data, then do a DIC and Rebuild.