problem in converting P6 file to P3 version

Dear guys,

I have a question that I realy need to know the answer immidiately:

I have some problem in converting a P6 file to P3 version,

1)I have a p6 file (XER), when I export it in P6 software as P3 format, some characters of my activity IDs that is 20 characters is removed. I changed the character numbers default (that is 10 character) to 20 Character in my P3 software but it still happen, I think when I am exporting it in P6 software, P6 use the defaults of p3 and change activity IDs to 10 character. how can I correct it?

2)some dates of activities changed in converting, although the calanders the same, what is the reason?

Regards

Shima