Description:
This table links the different payments to actual invoices and credit notes.

PRIMARY KEY
a_ap_document_id_i integer default: 0 NOT NULL	AP document ref	a_ap_document
a_payment_number_i integer default: 0 NOT NULL	Unique number to identify each payment batch.	a_ap_payment

a_ledger_number_i integer default: 0 NOT NULL	The ledger that the attribute value is associated with.	a_ledger, a_ap_payment
a_amount_n numeric (24, 10)	The amount of money that was paid
s_date_created_d date default: CURRENT_DATE	The date the record was created.
s_created_by_c varchar (20)	User ID of who created this record.	s_user
s_date_modified_d date	The date the record was modified.
s_modified_by_c varchar (20)	User ID of who last modified this record.	s_user
s_modification_id_t timestamp default: CURRENT_TIMESTAMP	This identifies the current version of the record.
FOREIGN KEY a_ap_document_payment_fk1: a_ledger_number_i => a_ledger a_ap_document_payment_fk2: a_ap_document_id_i => a_ap_document a_ap_document_payment_fk3: a_ledger_number_i;a_payment_number_i => a_ap_payment a_ap_document_payment_fkcr: s_created_by_c => s_user a_ap_document_payment_fkmd: s_modified_by_c => s_user