Check if there is some substitution defined in OBBH transaction which replaces the GL account during posting the parking document based on certain conditions.
As you are saying it happens sometimes and NOT always, check the entries to see if there is any difference between them. I am mostly guessing that there should be something unique in this one, which must be hitting a substitution rule, causing this.
Otherwise, if we are posting to the same account, the parking document should not be changed.
When there are no substituions in the system, I do not think any other possibility to happen this.
You can ask the user again to park to the same account and try to post again to double check whether it is being posted to other account or not. If it is really posting to different account, then there is an issue to be looked into.
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