Follow these steps if you have an extra or missing data condition.

1. Is the problem with input (data received by the application)? Is too much data being passed to the application?
   • If previous input is added to the end of the current input, the modified data tags may have been set improperly in previous TPUTs. Go to Reporting the problem to IBM.
   • If the backspace key, character delete key, or line delete key is not functioning properly, look for SVC 94 entries that may have changed the default in the STCC macro.

     If this does not account for the problem, get a dump of the nucleus, the CSA, and the user's address space. Then go to Reporting the problem to IBM.

   Is insufficient data being sent to the application program?
   • Find out which TGET option was used. TSO/VTAM edits data sent from the terminal before it passes it to the application program. The type of editing that TSO/VTAM does depends on the TGET option. Certain characters may be deleted, such as control characters, aid characters, and set buffer address (SBA) sequences. Look at the flag bytes in the TGET trace entry to see which TGET option was specified. See Table 1 to determine what document describes TGET options.
   • Find out whether any user edit exits are involved. User edit exits are listed in z/OS Communications Server: SNA Customization.
2. Is the problem with output (data sent by the application)?Was extra data sent to the screen?

   TSO/VTAM should not generate any printable data. Compare the data portion of the TGET/TPUT trace with the data in the VTAM® buffer contents trace.

   If you see printable data in the buffer contents trace that is not in the TGET/TPUT trace, go to Reporting the problem to IBM.

   If you see the same data in both traces, contact the group responsible for the application program that issued the TPUT.

   Was data from the application lost?

   TSO/VTAM does not generally delete data sent by the application program unless it is doing reshow processing. In reshow processing, TSO/VTAM deletes the full-screen TPUT and sends a reshow character (X'6E') to the full-screen application program. This is shown in the TGET trace entry. Compare the data portion of the TPUT trace entry with the data in the VTAM buffer contents trace entry to see whether any data has been deleted. Determine whether this is a TSO/VTAM problem or an application program error and contact the appropriate group.

   See Table 1 to determine what document contains more information on reshow processing.

3. If you have not resolved the problem, go to Reporting the problem to IBM.