Transfer...to ，when dump with exception.

When I transfer data to dataset, the data is a long string (ep: 0001 # 123445 # 44456 # aaabbb ) , when we LOOP at a internal table , and transfer this long string to dataset, it come across a exception ( CX_SY_FILE_IO ). the program dump

I have two question:

1、I check ST22 to see this situation, it run at the sy-tabix = 100, so in al11 do we have the 100 data or 99 data?

2、if it have the No100 data,  so I want to know whether the No100 data in al11 is complete ? or it just have part of the data such as ( 0001 # 123445 )