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Changing the Periodicity of the Pool Contract 
You can use this function to change the periodicity of the billing plan of a pool contract. When you do so, you change the periodicity of the linked contracts as well. When an aggregate contract is involved, both the usage billing plan and the pool redistribution plan are adjusted; only the pool redistribution plan is adjusted in the case of a single pool contract.

If active links exist, you have to start the specific action provided to change the periodicity of the pool billing plan.