This SuiteQL query returns the invoices to which a customer payment was applied.
SELECT
Invoice.TranID AS InvoiceID,
REPLACE( BUILTIN.DF( InvoiceMainLine.CreatedFrom ), 'Sales Order #', '' ) AS SONumber,
Invoice.OtherRefNum AS CustomerPO,
PTLL.ForeignAmount AS AmountPaid
FROM
Transaction AS Payment
INNER JOIN TransactionLine AS PaymentLine ON
( PaymentLine.Transaction = Payment.ID )
AND ( PaymentLine.MainLine = 'F' )
INNER JOIN PreviousTransactionLineLink AS PTLL ON
( PTLL.NextDoc = PaymentLine.Transaction )
AND ( PTLL.NextLine = PaymentLine.ID )
AND ( PTLL.LinkType = 'Payment' )
INNER JOIN TransactionLine AS InvoiceLine ON
( InvoiceLine.Transaction = PTLL.PreviousDoc )
AND ( InvoiceLine.ID = PTLL.PreviousLine )
INNER JOIN Transaction AS Invoice ON
( Invoice.ID = InvoiceLine.Transaction )
INNER JOIN TransactionLine AS InvoiceMainLine ON
( InvoiceMainLine.Transaction = Invoice.ID )
AND ( InvoiceMainLine.MainLine = 'T' )
WHERE
( Payment.ID = 7518243 )