Hi,
are you takling about NewGL or "Classic" GL with profit-center accounting in special legder 8A?
In the second case you can try to delete the existing profit-center data (as you have an own profit-center document, T-code 0KE1) and repost it again (1KE8, 1KE9, 1KEC,...).
Try in a test environment first if transaction currency figuers are transferred when you repost the documents.
BR Christian