Action don't reflect on the application

we'd need a bit more detail into what "the add button don't give result" actually means. Does it not add a new row? It does add a new row but doesn't show any data in the drop-down? You can add a new row and select an item from the dropdown but it then disappears again? 

Oh sorry for don't give clear clarification.

I mean that the add button does not add a new row.

Ok, thanks. When you add a new row where is the data for the row being stored. Are you adding it to a local variable or to a rule input on your interface?

This is the data, it is actually dropdown field and delete button:

I am adding into Rule Input.

Ok. So:

• a rule input (on an interface rule or an expression rule) is NOT a variable. That is, it cannot store any data because it is a pointer or a reference to a variable
• in your case I presume your interface is added to a User Input Task smart service in a process model
• unless you have a corresponding Activity Class variable defined and mapped to your rule input your data will disappear when you try and add a row
• Also unless you have defined your variable as a multiple (and array) you'll only be able to add one row

Hopefully that should give you some insight as to what's happening

Ok. So:

• a rule input (on an interface rule or an expression rule) is NOT a variable. That is, it cannot store any data because it is a pointer or a reference to a variable
• in your case I presume your interface is added to a User Input Task smart service in a process model
• unless you have a corresponding Activity Class variable defined and mapped to your rule input your data will disappear when you try and add a row
• Also unless you have defined your variable as a multiple (and array) you'll only be able to add one row

Hopefully that should give you some insight as to what's happening

I have another grid that adds a row to another rule input and it works perfectly. 

That might be true as you may be have correct mapping/cardinality in place for that, but it might be incorrect for the grid that isn't working. Check both and see if you can see what's different.