enhancement of 2lis_02_acc datasource..
i want to enhance 2lis_02_acc datasource. basically this data source based on EKKO,EKKN AND EKPO. i want to add PSPNR from PROJ Table and where EKKN.PRCTR = PROJ.PRCT.
please provide me the step by step solution for this. after adding the field to the datasource i want to extract the data for this field from PROJ.