import Notes to GL journals after journals been Posted.

Hi All, 

I have a scenario where GL journals have to be exported and imported in another ERP system. after the export we would like to mark these lines as being imported so they can be obvious on a GI. I can’t work out how to get the import scenario work using the same key module, batchnumber and line numbers. 

any hint would be much appreciated. 

What am I missing here ? 

error is not telling me much

Thank you