Multiple transaction codes for a SAP program

Question

Hi,
For some SAP programs , there are multiple tcodes in SE80.
As program is same with selection screen same as , for example 1000, how the functionality differes with different tcodes?
how is the code written to handle different tcodes in the same program?
Thanks for help in advance.
Regards,
Yogita

Answer 1

Hi,
  We have Different types of Programs such as Executable, Modulepool and Functionpools.
We can design different selection-screens, Normal Screens through all of the above program types with different transactions.
Based on transaction we can write its own functionality.
Ex: ZZ01 for change   => all fields in editable mode
      ZZ02 is for Display  => all fields in display mode. 
      (Module Pool, Normal Screen.)
declare one Module under PBO.  Module FIELD_ATTRIBUTES.
Write code like this:
   loop at screen.
      If sy-tcode = 'ZZ01'.
        screen-input = 1.
      elseif sy-tcode = 'ZZ02'.
        screen-input = 0.
      endif.
      modify screen.
   endloop.
  This is very small example. If you compare F-02 and FBS1 transactions, you can observe this method. We can observe more input fields in FBS1. This is based Configuration also.
Thank you,
Balaji Peethani,
Tanuku.