create receipt on customer level not including customer account and site

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Hello,

We have a customer with 4 accounts that has its own site. Each account represents one revenue type.

We created 4 individual invoices for each of these accounts. The customer pays 4 invoice in a lump sum.

Right now, we need to specify the customer and customer account when apply the receipt.

How can we create a receipt on customer level so we can apply to each account?

Thanks,

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