Using a ForeignKey part of the time.

I have a model called "transaction" in which one
of the fields in
called "source".

95% of the time I want "source" to be populated by
data from another
table using a ForeignKey- but not all of the time.

At the moment if I put in the Foreign Key I can only put the
related
table information into "source", via the Admin. 
If I don't put in the
Foreign Key then I don't get the reference to the other
table.

Is there an elegant way to handle this type of situation,
where you
need a Foreign Key for only part of the time?

MerMer


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