Mysql: Conditions on a unique primary key tuple - mysql

Question

Short
Is it possible, that if I have a unique primary key tuple (idUser,idRep) that for each idUser n only certain combinations with idRep are possible?
For example that the following groups of keys are allowed:
(n,1);(n,2);(n,3) OR (n,1);(n,6) OR (n,2);(n,5) OR (n,4);(n,3) OR (n,7)
but not the keys (n,1) and (n,7) together?
Long question
I have the following table
idUser | idGroup | idType |
where the primary key is (idUser,idGroup). There are three different values for idGroup: 1,2,3. For almost all users the idType is always the same independent of the group, but there are a few exceptions. Thus the table looks like that
idUser | idGroup | idType
--------------------------
1 | 1 | 43
1 | 2 | 43
1 | 3 | 43
2 | 1 | 22
2 | 2 | 22
3 | 1 | 12
3 | 3 | 12
4 | 2 | 5
4 | 3 | 6
I thought I could avoid the redundancy with a column idRep which contains the information in which groups one user is as follows
1 -> user is in group 1
2 -> user is in group 2
3 -> user is in group 1 and 2 (1+2=3)
4 -> user is in group 3
5 -> user is in group 1 and 3 (4+1=5)
6 -> user is in group 2 and 3 (4+2=6)
7 -> user is in group 1 and 2 and 3 (4+2+1=7)
this would reduce redundancy and the above table would shrink to
idUser | idRep | idType
-------------------------
1 | 7 | 43
2 | 3 | 22
3 | 5 | 12
4 | 2 | 5
4 | 4 | 6
However the disadvantage is that its possible that even if (idUser,idRep) is a primary key there is the possibility of a wrong entry like
idUser | idRep | idType
-------------------------
1 | 7 | 43
1 | 1 | 42
In this case, there is a contradiction about idType for idUser 1 in group 1.
So my question is: Is it possible to say that for a specific idUser n only the following groups of keys are allowed:
(n,1);(n,2);(n,3) OR (n,1);(n,6) OR (n,2);(n,5) OR (n,4);(n,3) OR (n,7)
but not for (n,1) and (n,7)?