Insufficient privilege to right a tag

I am networking a micro 850 and Scadapack 32. Most of the tags that right to the micro 850 are reading and writing well. But The tags from the Scadapack 32 are reading but not writing at all and some of the tags for the micro 850 say that I have insufficient privilege to right to the tags. This is confusing because Ive never experienced this before.
has anyone had this issue?