How to Allow Posted Document Modification in Microsoft Dynamics 365 Business Central

In Microsoft Dynamics 365 Business Central, posted documents are generally not meant to be modified directly. This is because posted entries are considered finalized records, and Business Central follows strict control to maintain data accuracy, auditability, and financial integrity.

However, in some real business scenarios, an organization may have a valid requirement to modify a field, update certain information, or insert data into a custom field even after posting. In such cases, developers cannot simply change the posted document from the page or table directly. Instead, the modification must be done carefully by using AL code and by handling permissions properly inside a codeunit.

Example – A company has created a custom field named “ERP Document Type” in the Posted Purchase Invoice table. After some purchase invoices were already posted, the business realized that this field also needs to store a value for old posted documents, so that the data can be used in reports, filtering, or integration scenarios.

Since Business Central does not allow direct modification of posted documents in normal conditions, we must handle this requirement through AL development. For this, we write logic inside a codeunit, assign the required permission on the posted purchase invoice table, and then update the custom field programmatically in a safe and controlled manner.

codeunit 82170 PPIModify
{
    Permissions = tabledata "Purch. Inv. Header" = rmid;
    procedure PPIERPDocumentTypeUpdate(var PurchInvHdr1: Record "Purch. Inv. Header")
    var
        PurchinvHdr: Record "Purch. Inv. Header";
    begin
        if PurchInvHdr1."No." <> '' then begin
            PurchinvHdr.Reset();
            PurchinvHdr.SetRange("No.", PurchinvHdr1."No.");
            if PurchinvHdr.FindFirst() then begin
                PurchinvHdr."ERP Document Type" := PurchinvHdr."ERP Document Type"::"Posted Purchase Invoice";
                PurchinvHdr.Modify();
            end;
        end;
    end;
}

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