What is the difference between parameter and parameters

hi everybody
what is the exact difference between parameter and parameters

Hi,
As far as selection-screens are concerned, the word PARAMETERS and PARAMETER is the same. I just tried it. Below is an example:
**PARAMETERS**
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001.
PARAMETERS: p_bukrs TYPE t001-bukrs OBLIGATORY,
            p_asof  TYPE bsis-budat OBLIGATORY,
            p_year  TYPE bsis-gjahr OBLIGATORY.
SELECT-OPTIONS: s_hkont FOR bsis-hkont NO INTERVALS OBLIGATORY.
SELECTION-SCREEN END OF BLOCK b1.
**PARAMETER**
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001.
PARAMETER:  p_bukrs TYPE t001-bukrs OBLIGATORY,
            p_asof  TYPE bsis-budat OBLIGATORY,
            p_year  TYPE bsis-gjahr OBLIGATORY.
SELECT-OPTIONS: s_hkont FOR bsis-hkont NO INTERVALS OBLIGATORY.
SELECTION-SCREEN END OF BLOCK b1.
Hope this helps...
P.S. Please award points for useful answers by clicking on the star on the left.

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