Get advances payments

I have advance payment and i am trying to get it in an invoice but the save button did not appear i do not know why!!
Although the balance of the customer who paid the advances is right so how i can solve this
thanks a lot

How did you take the advance? Payment entry or JV? Did you try to fetch the advance payment in to the sales invoice by using the get advance button?

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Thank you very mush but i solve this .