How to make a field unique accross two or more tables?

Hi Experts,
We have a requirement where we need to establish uniqueness for accross two fields of two different tables.
Consider the following example:
Table Table1 has Field Field1 and Table Table2 has Field Field2.
Table1>Field1 have the following values:
   Mnum_1
   Mnum_2
   Mnum_5
and Table2>Field2 have the following values:
   Mnum_3
   Mnum_4
   Mnum_6
Now we need to have the uniqueness defined in such a way that, adding Mnum_1 into Table2>Field2 should violate the constraint. And simillary adding Mnum_3 into Table1>Field1 should violate the constraint.
We should be able to add a new value, say Mnum_7, into either of the column, but after adding into one, we should not be able to use the same value into the other table.
We are using SAP MDM 5.5 SP06.
Please let me know if this is possible and how. Even if we could define it using some valiation it would be helpful.
BTW, Table1 is the Main table and Table2 is a Look Flat table.
Thanks in Advance.
Regards,
Uday

Hi Uday
this is not possible. Unique keys are defined for a table and we cant link this definition across different tables.
Even Validations work at atable level hence we can not check for the unique key violation using validations as they are in two diff tables.
consider introducing 1 more field in table1 or 2 for defining the uniqueness may be or revisit the data model.
Otherwise this can be controlled outside MDM. How are you maintaining values in these 2 tables- manually or via import. If this is via import and say the source files are excel then this can be checked in the excel sheet itself.
best regards
Ravi

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