Note you cannot import a journal with more than 9,999 lines. Now you will have to change the activity code related to the journal entry screen (GAS and maybe VLT & VTP depending on the number of analytical lines) to the highest number of lines in your biggest journal.

Be careful, increasing the activity codes would likely require the memory setup on the folder (maxmem and sadmem).

At worst, try without changng the memory (in your test environment at first) and if you run in error message such as out of memory then you know you have to increase the value