KTFB. you are missing the point! as shown in Wag's vid on the AGM 154A, in TOO mode, he set the tgt by selecting a WP directly over the TGT.
You only set the LaT/Long in PP mode.
I think 9line is correct stating that the WP Altitude MUST me set at tgt altitude , and HT set for burst height, but I couldn't find any reference anywhere for that!
BAD (or no) documentation is a hallmark of DCS it seems! :(
I feel this is a BUG, or at least poor instructions form Sim trng vids!