Actually, I came up with this right after I posted:

** Procedure AfterRowColChange
LOCAL cAlias, lEnable 

cAlias = This.RecordSource
		
lEnable = NOT (&cAlias..EType = ETYPE_INVOICED)
		
.Column10.Text1.Enabled = lEnable
.Column8.Text1.Enabled = lEnable

This allows me to still navigate, but the field I want blocked
appear disabled when you navigate, only on the effected records.