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techDisplays: Failed to set layer-purpose

Fabb
 Hello,
 
While generated a new techFile, i got the following WARNING 
 
INFO (TECH-180024): Created techfile library "xxx" 
INFO (TECH-180006): Compiling class 'controls'....
INFO (TECH-180006): Compiling class 'layerDefinitions'....
*WARNING* (TECH-280076): techDisplays: Failed to set layer-purpose pair display attributes because the LPP is not defined in local database.
          The LPP display attributes can only be set in the database where the LPP is defined - (MTJ drawing MTJ_drawing t t t t t).
*WARNING* (TECH-280085): *ERROR* Failed to define layer display for (MTJ drawing MTJ_drawing t t t t t).
INFO (TECH-180006): Compiling class 'layerRules'.
 
 
the related techFile code is
 

;********************************
; LAYER DEFINITION
;********************************
layerDefinitions(

techLayers(
;( LayerName                 Layer#     Abbreviation )
;( ---------                 ------     ------------ )
;User-Defined Layers:
( MTJ                   400        MTJ          )
);techLayers

techDisplays(
;( LayerName    Purpose      Packet          Vis Sel Con2ChgLy DrgEnbl Valid )
;( ---------    -------      ------          --- --- --------- ------- ----- )
  ( MTJ          drawing      MTJ_drawing      t t t t t )
);techDisplays

) ;layerDefinitions
 
 
What is wrong ?
 
Regards,

fabrice 
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