[SI-V20-INV-R000]-This XML instance is NOT tagged as an SI-UBL 2.0 invoice or credit note; please check the CustomizationID value [BR-GA-0] When using the G-account extension, the CustomizationID must specify this. [BR-GA-1] The number of Payment Terms (NL-GA-01) in each invoice MUST be two. [BR-GA-2] The number of Payment Instructions (BG-16) in each invoice MUST be two. [BR-GA-3] Sum of Amount due for payment (BT-115) = ∑ Payment Amount (NL-GA-03) [BR-GA-7] There MUST be a Payment Means identifier (NL-GA-04) with a value equal to 'GACCOUNT' [BR-GA-4] Each Payment Terms (NL-GA-01) MUST include a Payment Means reference (NL-GA-02) [BR-GA-5] Each Payment Instructions (BG-16) MUST include a Payment Means identifier (NL-GA-04) [BR-GA-6] The value of each Payment Means reference (NL-GA-02) MUST correspond with one and only one Payment means identifier (NL-GA-04)