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The selected assembly seems to be a custom part. It is strongly recommended to add this assembly as custom part to the assembly. Do you want to add the assembly as custom part?

Last updated March 1, 2018 by Tekla Global Support tekla.globalservicesupport@trimble.com

Environment: 
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The selected assembly seems to be a custom part. It is strongly recommended to add this assembly as custom part to the assembly. Do you want to add the assembly as custom part?

Question:
I try to connect a steel assembly to another assembly as a sub-assembly, but I get this message even if I don't have custom parts or custom components in the selected assembly. What this means and what should I answer?