Ehm, noone said MetaMan yet? Doint BDC by hand is such a pain... MetaMan is the best tool out there. And now also web based. (ok Nick you can cough up a with a dev license now ;-) Nah seriously, its an expensive tool, and the licensing model sux (for devs at consultancy companies that has lots of different customers) but the tool is top notch and saved me more times than i care to remember from doing tedious XML