Strange Sheet Layout Results - Scale Differences Traced to Sheet Unit Setting in Model Properties

We have a number of different size sheets defined in our customsheets.def file but only use ANSI A and ANSI D almost exclusively with ANSI D the most common.

We created these in their DGN files following a practice that originated way back in the days of IGDS. The working units are set to match our normal design models - US Survey Feet as MU and US Survey Inches as SU. We actually draw the graphics for the sheets using MU values, so 8 1/2 X 11 are draw 8 1/2 feet by 11 feet and 22 X 34 is drawn 22' X 34'. Our units, scales and sheetsizes.def files are setup to accommodate those graphics settings, so for us, 50 scale is not 1:600, but is simply 1:50.

When sheet models became available, we started making the model that contained the border graphics sheet models with their sheet layout aligned to their cut lines. This went without a hitch on all of our ANSI D sheet files. We never got around to doing the same thing for our ANSI A sheet files, until today. But when I tried to do exactly the same thing I did in our ANSI D files, the sheet layouts were coming in too small. I found I had to change the scale from 1:1 to 1:12. I looked at all the settings I could think of and was pretty stumped, until I finally spotted a sheet model setting called Sheet Unit. In the ANSI D sheet models, the Sheet Unit matches the Working Units MU. But on my ANSI A sized sheet models, the Sheet Units are inches.

Why are these different and where can I modify them so they are not different. The Sheet Unit is grayed out on the model properties, meaning I can't edit them here.

These are the settings in the sheetsizes.def file:

# Name           Units Height Width TopMargin LeftMargin BottomMargin RightMargin UnitSystems
#Roll paper sizes.
ANSI A           ; 1  ; 8.5  ; 11  ;   0.00  ;  0.00  ;     0.00   ;    0.00     ; 1,3
ANSI A (Profile) ; 1  ; 11   ; 8.5 ;   0.00  ;  0.00  ;     0.00   ;    0.00     ; 1,3
ANSI B           ; 1  ; 11   ; 17  ;   0.00  ;  0.00  ;     0.00   ;    0.00     ; 1,3
ANSI C           ; 1  ; 17   ; 22  ;   0.00  ;  0.00  ;     0.00   ;    0.00     ; 1,3
ANSI D           ; 1  ; 22   ; 34  ;   0.00  ;  0.00  ;     0.00   ;    0.00     ; 1,3
ANSI E           ; 1  ; 34   ; 44  ;   0.00  ;  0.00  ;     0.00   ;    0.00     ; 1,3


 

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