Runtime value mapping

hey ,

The requirement is like a record is being accessed from the database through a JDBC adapter into XI.In the record there are different fields concatenated as a string and these fields are to be mapped to the target side i.e Idoc which can be done by extracting the fields according to the length using substring function.Now, some src fields say "code" "sign" "cause "

are having some combination of values and these combinations are deciding the value of other fields Mv_TYP MV_REAS COSTCENTER GM_CODE MVT_ IND

in the Idoc .i.e runtime value of these three fields is deciding the value of other fields in the Idoc.

e.g

Source

Description Sign Cause Code

1PO/STO + 1 none

2rvrs PO/STO - 1 none

3returngoods + 1 none

4RevrsRtrnGoods - 1 none

5RvrsScrap + 1 none

6Qty2Qlty - 6 none

Corresponding target

Mv_TYP MV_REAS COSTCENTER GM_CODE MVT_ IND

101 none 01 B

102 none 01 B

202 1072 511100 03

201 1072 511100 03

552 03

322 none 06

How to do the value mapping so as to have the runtime value of src in the target fields in the Idoc