It is not possible to see the sub-item in the Items facet of an Installation Point.
SAP Cloud for Customer.
Reproducing the Issue
Go to the Installed Base work center.
Go to the Installation Point view.
Search for Installation Point PQR(where PQR is the Installation Point for e.g. with category as Functional Location) and open it.
Go to the Items facet.
Click on the line-item LMN (where LMN represent Installation Point Item).There exist another Installation Point Item LMN1(where LMN1 represent another installation point item, which is hierarchy under LMN).
There is no option to expand node and see installation point LMN1 which is under LMN.
You need to adapt/personalize the Items Hierarchy facet within Installation Point to see all sub-items/nodes which are hierarchy under it.
The hierarchy level is not shown under Items facet, but under Items Hierarchy facet in Installation Point and this is expected system behavior.
Item Hierarchy, sub-item , node , KBA , installation point , LOD-LE-IBA-IPO , Installation Point , Problem