transactions are missing purchase history Bitcoin.de

Describe the problem:

transactions are missing purchase history with bitcoin.de

Missing 0,0005 btc
Which exchange/wallet is this regarding?

How did you import data into this wallet?
via cvs

What have you tried to fix this so far?
Contacted bitcoin.de, but they cannot find the transaction either and told me to get in contact with you.
Are you able to help?

Thanks in advance

Hi @heulerchen

First, review your transactions to ensure your full transaction history has been imported correctly and that there are no duplicates or gaps in the data.

If the file is still missing some information, you can manually add the missing transactions to reflect the correct amounts.

Check out this guide and also How to add transactions manually.