Activities not being displayed on Approve Time Activities

Question

I am having trouble listing the Work Activity in Approve Time Activities Screen (EP507010). I created some 'Work Item' activities for a case.

I can see those activities in Employee Time Activities Screen (EP307000).

But, whenever I tried to load the case Work Item in Approve Time Activities Screen so that I (Owner of the case or Supervisor of Employee) can't see the Work Item.

I have tried several options such as:

1. Close the Case
2. Attach the Case to Project and Contract
3. Make sure the Case Class is set to Billable
4. Close the Work Item etc.

But none of these make it work.

PS: Though it's obvious, I have also made sure the features are set to Enable.

Thank you.