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Like other Count "Any"-events this event is executed for all each of four the different receive count document sources (Warehouse Receipt, Purchase Order, Transfer Order and Sales Return OrderJournal Batch, Item Journal Batch).
If you are implementing changes only for a specific document source, you likely should use one of the document-source-specific events (see "This event is executed after...", below).

Steps with no "conditions" are better created using the OnGetCountOrderLines_OnAddStepsToAnyHeader-event.

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    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Count", 'OnPostCountOrder_OnAddStepsToAnyBatch', '', true, true)]
    local procedure OnPostCountOrder_OnAddStepsToAnyBatch(var _OrderValues: Record "MOB Common Element"; _RecRef: RecordRef; var _Steps: Record "MOB Steps Element")
    begin
    end;

Example

    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Count", 'OnPostCountOrder_OnAddStepsToAnyBatch', '', true, true)]
    local procedure MyOnPostCountOrder_OnAddStepsToAnyBatch(var _OrderValues: Record "MOB Common Element"; _RecRef: RecordRef; var _Steps: Record "MOB Steps Element")
    begin
        // Break if some condition to include news step(s) is not met
        // if .... then
        //    exit;

        // Break if new datestep is already collected to prevent infinite loop
        if _OrderValues.HasValue('MyPostingDate') then
            exit;

        // Create a new date step for manually selecting Posting Date
        _Steps.Create_DateStep(10000, 'MyPostingDate');
        _Steps.Set_header('Posting Date');
        _Steps.Set_minDate(Today() - 10);
        _Steps.Set_maxDate(Today());
    end;

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