I assume you’re using SEU to enter the text. If I were you, I would create another QTXTSRC file with a larger record length. The default is 92 which allows 80 characters for text, 6 for the date, and 6 for the sequence number. When creating the new file using CRTSRCPF, enter a length of 112 which will give you 100 characters for the data with the date and sequence number remaining at 6 each. You could then copy your original QTXTSRC data to this new file then delete the old one.
Hope this helps.