[WD20] HTransactionStart ERROR (no replies)

Hi,
I'm trying to use the function HTransactionStart on two connections MySQL and HFSQL.
The first works correctly, the second not...

The error is:
Unable to start transaction.
<C:\MyWrongDirectory\MyFile> file not found
Files in transaction must not be moved or deleted.

It seems that the transaction searches the file in a wrong directory (MyWrongDirectory).

The property "MyFile..Directory" gives me the right directory (one different from the one in the error).

Any ideas?

Thanks