Occurs if using composite materials (boards) and the definition of the composite material is not complete.
For example, when you attempt to optimise a part list where some of the parts are using pre-laminated materials. The message usually indicates the part or parts that are causing the problem.
Check the definition of the pre-laminated material for each part that is causing a problem and re-try the operation.
A typical cause of this problem is where one of the material codes in the material combination box for a part is not correct so that the material cannot be found in the board library.
If the material combination for a part and board library are as follows - this illustrates the problem when the part list is optimised.
Material combination
CHIPBOARD-18MM
EBONY-LAM-1MM
EBONY-LM-1MM
Materials in board library
CHIPBOARD-18MM
EBONY-LAM-1MM
Note - Composite materials are also called 'pre-laminated materials'
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