Sap query and additional fields.

Question

Hello guys.
ABAP it's not my strong skill, but i need to develop some report.
What i need:
input: material, SLED, plant
output: material, SLED, plant, values from characteristic field.
I have created sap query with additional field type c.
Below my code:
TYPES: BEGIN OF charast,
        ATNAM(50)    TYPE c,
        ATWTB(8)     TYPE n,
        X(50)        TYPE n,
        C(50)        TYPE n,
        ATINN(50)    TYPE n,
        END OF charast.
DATA: char TYPE TABLE OF charast WITH HEADER LINE.
CALL FUNCTION 'VB_BATCH_GET_DETAIL'
   EXPORTING
     MATNR              = MCH1-MATNR
     CHARG              = MCH1-CHARG
     GET_CLASSIFICATION = 'X'
   TABLES
     CHAR_OF_BATCH      = char.
LOOP AT char into TEST (This is an additional field type C.
   ENDLOOP.
Questions:
1. How i can return internal table into standard abap type, because i can create additional field only with standart types.
2. Need i fetch exporting parameters before calling FM? Or sap query do it automatically, based on given values on selection screen of the report?
3. How i can return only needed field from FM output? Now, when i'm executing FM via SE37 it's show desired result, but when i'm getting it from code i see strange values.
4. If i don't know exactly return by an FM values, how i can fill structure dynamically?
5. How i can return result of a program not only to additional field but to layout?
Sorry for noob questions and thank you in advance guys!

Answer 1

Well, seems like it work fine for me.
Below my crappy, but working code:
DATA: material TYPE MCHB-MATNR,
       batch    TYPE MCHB-CHARG,
       plant    TYPE MCHB-WERKS,
       sloc     TYPE MCHB-LGORT,
       gtdt     TYPE STANDARD TABLE OF clbatch,
       gtdit    TYPE clbatch.
SELECT MATNR INTO material FROM MCHB
   WHERE MATNR = MCHB-MATNR.
ENDSELECT.
SELECT CHARG INTO batch FROM MCHB
   WHERE CHARG = MCHB-CHARG.
ENDSELECT.
SELECT WERKS INTO plant FROM MCHB
   WHERE WERKS = MCHB-WERKS.
ENDSELECT.
SELECT LGORT INTO sloc FROM MCHB
   WHERE LGORT = MCHB-LGORT.
ENDSELECT.
CALL FUNCTION 'VB_BATCH_GET_DETAIL'
   EXPORTING
     MATNR = material
     CHARG = batch
     WERKS = plant
     GET_CLASSIFICATION = 'X'
    TABLES
      CHAR_OF_BATCH = gtdt.
READ TABLE gtdt INTO gtdit
   WITH KEY atnam = 'BATCH_SHELF_LIFE_EXPIRY_DATE'.
GTD = gtdit-ATWTB.