Solid Edge Part under sub-assembly not visible in top level assembly

Used called sub-assembly to Main assembly, the particular part in the sub-assembly did not displayed.

He upgraded all parts from the component tracker, activated the sub-assembly, and replaced that sub-assembly with the same one. However, the part in sub-assembly remains invisible.

He also tried opening the top assembly on another computer, but the part of sub-assembly did not displayed in top level assembly.

Open/ Edit the sub-assembly and see it's occurrence properties. If the occurrence property “Higher Level Display” is set to “No” for those parts, then it will not be displayed when the sub-assembly is pleased under Top level assembly. 

Set the option to 'YES' for all those parts in the sub-assembly that to be displayed when placed the sub-assembly under Top level assembly. 

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