Answer / kartikeya bommuluri

The call transaction mode can take the following values:
'A' Display screen
'E' Display only if an error occurs
'N' Do not display
'P' Do not display; debugging possible


If the MODE addition is omitted, then the processing mode
is 'A'.
If a screen is displayed in processing mode 'E' because the
system reached the end of the BDC data, the system
automatically switches to processing mode 'A'.
If breakpoints are set in a transaction tcod called using
the CALL TRANSACTION tcod USING itab variant, these are not
actually reached in 'N' mode. The system tries to insert
data in the Debugger screen; the call ends with SY-SUBRC =
1001 and the message "Batch input data is not available for
screen SAPMSSY3 0131" (S 00 344).

Conversely, in 'P' mode, transaction screens are processed
in the background (as in 'N' mode) and debugging is
possible.

Answer / jyothi

there r 3 modes in call transaction.
1. A - all screens
2. E - error screens
3. N - no screens

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