update rules are the connection between infosource and datatarget. Start routine is available in update rule. you can write startroutine in update rule to eliminate unnecessary data...For example you have ordertypes fs10,fs 20, fs30, but in bw you only want to analyze only fs10 and fs20,,then in start routine you can write that only fs10 and fs20 should be loaded..in this way you can use start routine....In transfer rules you can write some caliculations or conversion..infact you can write in update rules as well...the main difference is that writing in transfer rules mean its global where as writing in update rules is applicable to only tat data target.
transfer routine
abap code used in transfer rules to transform or finding some field. ex:- may be you want to retrieve the field data from some data base tables based on the other data present in the infosource
I HAVE DOUBT REGARDING TO BC . ACTUALLY I READ DOCU . ACTUALLY 3 VERSIONS . D, M , A . I KNOW ABOUT D,A . WHAT IS MODIFY VERSION IN BUSINEE CONTENT . IN WHICH SCEANARIO WE CAN USE THE MODIFY VERSION.
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