Checked for a way that can be used in making the multi-select dropdown work and be dependent on business unit dropdown as the added function still not working.
While the multi-select dropdown is not yet OK, move to fix the report by resource report, reverted the changes made in the web application in the report to get it working, and will insert one by one the changes to see where it is having an error, check the reverted web application, as per checking, the changes do not take effect, continued to modify the web application to check why any changes are not taking effect in the report.