HELP! What is wrong with my code? Trigger after update problems

I have a multiple choice field with two options; 'Salvage' and 'Staff Purchase'.

I have the code set up to create a line in another table when 'Salvage' is selected, and delete it if not (thanks to Dean again, if you're reading this).

However, I'm trying to make it more complicated by having the option repeat but with a different table if 'Staff Purchase' is selected.

This is my code currently:

let key := this;
if 'Salvage SP' = 1 then
let p := Part;
let d := 'Damage Type';
let c := Comment;
let s := Specification;
let r := Cost;
let t := (create Salvage);
'Salvage Primary Key' := t.Id;
t.(Frameset := key);
t.('Part / Item' := p);
t.('Damage Type' := d);
t.(Comment := c);
t.(Specification := s);
t.(RRP := r)
else
if 'Salvage SP' = 0 or 2 then
let pk := 'Salvage Primary Key';
delete (select Salvage where Id = pk)
else
if 'Salvage SP' = 2 then
let p := Part;
let d := 'Damage Type';
let c := Comment;
let s := Specification;
let r := Cost;
let t := (create 'Staff Purchases');
'Staff Purchases Primary Key' := t.Id;
t.(Frameset := key);
t.('Part / Item' := p);
t.('Damage Type' := d);
t.(Comment := c);
t.(Specification := s);
t.(RRP := r)
else
if 'Salvage SP' = 0 or 1 then
let pk := 'Staff Purchases Primary Key';
delete (select 'Staff Purchases' where Id = pk)
end
end
end
end

When I select 'Salvage' it creates a line in that table as planned, and when I deselect it, it deletes it, all good. 

The 'Staff Purchase' selection is not working at all however.

Either my code is wrong somewhere, or I'm trying to do too much functionality in this one trigger (likely both)...can anyone help please? Thanks!