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Use this event to

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    // [Template]
    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Adhoc Registr.", 'OnPostAdhocRegistrationOnToteShipping_OnBeforeModifyWarehouseShipmentHeader', '', true, true)]
    local procedure OnPostAdhocRegistrationOnToteShipping_OnBeforeModifyWarehouseShipmentHeader(var _RequestValues: Record "MOB NS Request Element"; _ToteFilter: Text; var _WhseShptHeader: Record "Warehouse Shipment Header")
    begin
    end; 

Example

For you to read step values "ShippingAgentCode" and "ShippingAgentServiceCode" you must first create these steps: See OnGetRegistrationConfiguration_OnAddSteps

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    // [Example]
    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Adhoc Registr.", 'OnPostAdhocRegistrationOnToteShipping_OnBeforeModifyWarehouseShipmentHeader', '', true, true)]
    localprocedure MyOnPostAdhocRegistrationOnToteShipping_OnBeforeModifyWarehouseShipmentHeader(var _RequestValues: Record "MOB NS Request Element"; _ToteFilter: Text; var _WhseShptHeader: Record "Warehouse Shipment Header")
    var
        ShippingAgentCode: Code[10];
        ShippingAgentServiceCode: Code[10];
    begin
        // prerequisite: the "ShippingAgentCode"- and "ShippingAgentServiceCode"-steps must to be created from separate event to be able to actually read this value here
        // see: https://docs.taskletfactory.com/display/TFSK/OnGetRegistrationConfiguration_OnAddSteps
        ShippingAgentCode := CopyStr(_RequestValues.GetValue('ShippingAgentCode'), 1, MaxStrLen(ShippingAgentCode));
        ShippingAgentServiceCode := CopyStr(_RequestValues.GetValue('ShippingAgentServiceCode'), 1, MaxStrLen(ShippingAgentServiceCode));

        _WhseShptHeader.Validate("Shipping Agent Code", ShippingAgentCode);
        _WhseShptHeader.Validate("Shipping Agent Service Code", ShippingAgentServiceCode);
    end;

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