Drupal Hosts : Store extra information with node reference

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This is a drupal question asked by bibstha on 11 June 2009

I want to store an extra information that is related with the relation between two content types.

The content types are
a) Service Provider
b) Ringtone

A Ringtone is provided by many service providers.
For each Service provider the code of the Ringtone is different

For ServiceProvider A, the code of the Ringtone is K98765,
for Service Provider B, the code of the Ringtone can be M98765

How can I relate this? I am planning to have a node reference from Ringtone to ServiceProvider. But it does not feel right since I cannot store the code of the Ringtone that way. Is there any other way?

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