Generally, in most Sys-Ex, there is a header byte that specifies which model machine the sys-ex pertains to. What may be going on is that the BK is ignoring G70 sys-ex. Or at least, some of it.

We need to get this to Roland ASAP, as obviously, they don't want us older Roland arranger users tearing our hair out (what little is left!) when all our edits from older machines get ignored!