Asset Report

When user is running Asset report in T.Code S_ALR_87012030

And I am selecting List of Assets it showing following results

Ex:

200166 Name 1 xxx

200166 Name2 xxx

200166 Name 3 xxx

200166 Name 4 xxx

200177 Name 1 xxx

200177 Name 2 xxx

If I am selecting Main number only

It is showing

200177 Name 1 xxx

200177 Name 2 xxx

Not showing the 200166 Assets what is the reason

If it shows only main assets it should show 200177 also

Thanks

Chiru