[new-owner-report] fix: invoice->payments renders full amount

For payments spanning multiple invoices, previously it would render
partial payment amount. But this info duplicates the invoice
details.

By rendering the full payment amount, it will ease tracking with other
invoices paid with same payment.

If the payment transaction originates from a different currency, the
invoice->payments table will render it in the originating currency.

gnucash/report/business-reports/new-owner-report.scm

@@ -305,36 +305,42 @@
              currency total #f #f #f #f (list (make-list link-cols #f))))
 
   (define (make-invoice->payments-table invoice invoice-splits currency txn)
-    (append
-     (map
-      (lambda (pmt-split)
-        (list
-         (qof-print-date
-          (xaccTransGetDate
-           (xaccSplitGetParent pmt-split)))
-         (let ((text (gnc-get-num-action
-                      (xaccSplitGetParent pmt-split)
-                      pmt-split)))
-           (if (string-null? text)
-               (_ "Payment")
-               text))
-         (make-cell
-          (gnc:make-html-text
-           (gnc:html-markup-anchor
-            (gnc:split-anchor-text pmt-split)
-            (gnc:make-gnc-monetary
-             currency (- (xaccSplitGetAmount pmt-split))))))))
-      (filter (lambda (s) (not (equal? (xaccSplitGetParent s) txn)))
-              invoice-splits))
-     (if (gncInvoiceIsPaid invoice)
-         '()
-         (list
-          (list (gnc:make-html-table-cell/size 1 2 (_ "Outstanding"))
-                (make-cell
-                 (gnc:make-gnc-monetary
-                  currency
-                  (gnc-lot-get-balance
-                   (gncInvoiceGetPostedLot invoice)))))))))
+    (let lp ((invoice-splits invoice-splits) (result '()))
+      (cond
+       ((null? invoice-splits)
+        (reverse
+         (if (gncInvoiceIsPaid invoice)
+             result
+             (cons (list (gnc:make-html-table-cell/size 1 2 (_ "Outstanding"))
+                         (make-cell
+                          (gnc:make-gnc-monetary
+                           currency (gnc-lot-get-balance
+                                     (gncInvoiceGetPostedLot invoice)))))
+                   result))))
+       (else
+        (let* ((lot-split (car invoice-splits))
+               (lot-txn (xaccSplitGetParent lot-split))
+               (tfr-splits (xaccTransGetPaymentAcctSplitList lot-txn)))
+          (let lp1 ((tfr-splits tfr-splits) (result result))
+            (cond
+             ((equal? lot-txn txn) (lp (cdr invoice-splits) result))
+             ((null? tfr-splits) (lp (cdr invoice-splits) result))
+             (else
+              (let* ((tfr-split (car tfr-splits))
+                     (tfr-acct (xaccSplitGetAccount tfr-split))
+                     (tfr-curr (xaccAccountGetCommodity tfr-acct))
+                     (tfr-amt (xaccSplitGetAmount tfr-split)))
+                (lp1 (cdr tfr-splits)
+                     (cons (list
+                            (qof-print-date (xaccTransGetDate lot-txn))
+                            (let ((num (gnc-get-num-action lot-txn lot-split)))
+                              (if (string-null? num) (_ "Payment") num))
+                            (make-cell
+                             (gnc:make-html-text
+                              (gnc:html-markup-anchor
+                               (gnc:split-anchor-text tfr-split)
+                               (gnc:make-gnc-monetary tfr-curr tfr-amt)))))
+                           result)))))))))))
 
   (define (make-payment->invoices-list invoice payment-splits)
     (list