Hi
As it says you cannot have more than 100 rows in the engineering data - you have at least or more than 139 rows that is why (that is also why they are yellow).
I see this material is related to Maxwell, and normally the materials are defined within Maxwell at least from what I have done in the past (when using Maxwell for some parts) - if you would like to know more about Maxwell material definitions post this under electronic category.
https://forum.ansys.com/forums/forum/discuss-simulation/electronics-2/
All the best
Erik
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