Using Model Check to control setting items to desired layers.
1.      Have a layer called 2__DEF_CSYS & 2_ALL_CSYS
2.      On layer 2__DEF_CSYS is the single default "F4(CSYS_PART_DEF)?
3.      I have a config.pro setting that any newly created "csys" will 
automatically be placed on layer 2_ALL_CSYS
4.      Model Check is configured to move any ?CSYS?s?  that are not on a 
layer to the 2_ALL_CSYS layer
Scenario:
a.      User creates a new Datum Coordinate ?F8(CS0)? which automatically 
gets placed on the ?2_ALL_CSYS? layer
b.      User runs Model Check with no errors, all csys?s are on layers
"F4(CSYS_PART_DEF)? is on 2__DEF_CSYS 
?F8(CS0)? is on 2_ALL_CSYS
c.      If the user for what ever reason removes a CSYS from the 
2_ALL_CSYS layer, Model Check will want to put it back on the 2_ALL_CSYS
d.      This is were the issue arises. Model Check sees that there is a 
CSYS not on a layer and moves it to a layer, but it is also moving the 
"F4(CSYS_PART_DEF)? from the  2__DEF_CSYS. 
The default CSYS should remain on 2__DEF_CSYS. When Model Check is run 
again it puts the "F4(CSYS_PART_DEF)? back on the default layer.
We have something similar setup for the datum?s that works with out an 
issue
Below is a segment of our Model Check file
PRT_LAYER       1__DEF_PLANES   BLANK           LIST_DEF EXCLUSIVE
PRT_LAYER       1_ALL_PLANES    BLANK           DATUM_PLANES
PRT_LAYER       2__DEF_CSYS             BLANK           CSYS_PART_DEF
PRT_LAYER       2_ALL_CSYS              BLANK           CSYS
PRT_LAYER       3_ALL_AXES              BLANK           AXIS
PRT_LAYER       4_ALL_POINTS    BLANK           DATUM_POINT 
PRT_LAYER       5_ALL_CURVES    BLANK 
PRT_LAYER       6_ALL_SURFS             BLANK           DATUM_SURF
PRT_LAYER       8_GTOLS         BLANK           GTOLS
PRT_LAYER       9_COSM_FEATS    BLANK
PRT_LAYER       ALL_DIMS                NORMAL
PRT_LAYER       GENERAL_NOTE    BLANK
PRT_LAYER       KEY_CHAR                BLANK 
PRT_LAYER       NOTES                   BLANK 
PRT_LAYER       REVISION                BLANK
LIST_DEF        SIDE
LIST_DEF        TOP
LIST_DEF        FRONT
Regards,
Robert Altman
General Dynamics Amphibious Systems
CAD Management
703.490.7533
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