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Selection screen is not like only displaying some input fields. If there are multiple input fields in the screen based of several criteria, then you have to make different blocks so that user can get the screen data properly.
There are several syntaxes used to design and position selection screen fields
To position the next parameter or comment on the selection screen, the POSITION option is used.
SELECTION-SCREEN POSITION <pos>.
For <pos>, you can specify a number, POS_LOW, or POS_HIGH.
To create a logical block of elements on the selection screen, mark the beginning of the block with the BEGIN OF BLOCK option of the SELECTION-SCREEN statement, then define the individual elements and mark the end of the block with the END OF BLOCK option as shown below:
SELECTION-SCREEN BEGIN OF BLOCK <block>
[WITH FRAME [TITLE <title>]]
[NO INTERVALS].
SELECTION-SCREEN END OF BLOCK <block>.
Blocking Selection Screen code example:
SELECTION-SCREEN BEGIN OF BLOCK rad1 WITH FRAMETITLE text-002.
PARAMETERS vendor RADIOBUTTON GROUP gr1.
PARAMETERS customer RADIOBUTTON GROUP gr1.
PARAMETERS material RADIOBUTTON GROUP gr1.
SELECTION-SCREEN END OF BLOCK rad1.
