adding new line item using bdc

hi frends,

i am using a bdc program to park the document. it is working fine.now i need to add one more field to the sap screen by using the existing bdc program. i have done recording and found the screen number where the new field is updating. now in my bdc program i have made changes to that particular screen and added the new field . but still the value is not updating in sap screen.pls help.thanx in advance.