Wondering how the components list is filtered on a maintenance order ( IW33 )

I'm wondering how the components list is filtered on a maintenance order ( IW33 ).

If I open a maintenance order I only see one component listed on it.

If I run "select * from RESB where AUFNR = '000000901798 ' and MANDT = 801" I get two rows.

If I run: BAPI_ALM_ORDER_GET_DETAIL I also see two records.

I am not sure how the one row is getting filtered out of the UI.

Wondering if anyone has any ideas, or how I would figure this out.

I was able to run st05 and see that RESB is used in CO_BC_RESB_PRE_READ and I tried debugging through that but it's a bit over my head.