Pass multiple parameters via IN statement to HANA procedure

I have a requirement where I need to pass multiple single values to a procedure in HANA -

For example: I create a procedure called HANA_PROCEDURE with following input and output parameters.

• INPUT: is a Scalar Parameter; has  data type VARCHAR and has length = 200

     Document number > VARCHAR(200)

     Account > VARCHAR (10)

HANA_PROCEDURE CODE:

BEGIN

"OUTPUT" = SELECT "DOCUMENT_NUMBER" "ACCOUNT" FROM _SYS_BIC_ANALYTICAL_VIEW

GROUP BY "DOCUMENT_NUMBER" "ACCOUNT";

END;

Next i call the procedure -

call "_SYS_BIC"."user/HANA_PROCEDURE"(?,?)

pops up a "Prepared SQL tab" that prompts me to enter the input values. I enter one value =  input1 ....and it returns values

as soon as i enter 'value1', 'value2' it chokes and does not return anything.

NOTE: if i hard code the input values int he procedure code in this exact same format i,e, 'value1', 'value2'....works just fine and returns records for both the values.

I think the internal format for the input variables is getting messed up somehow. ANy ideas how i can get these multiple single inputs to work?

Thank you in advance.

• OUTPUT: Table type with following fields