Polish OOB question

[void1984]

There's a problem with "Vickers Tk Sec" in September '39. It has no available tank to buy at that point.
That's because Poland has many incarnation of "Vickers E Mk.A" for different periods (units 638 - 642), and platoon and company formations have 2 incarnations each (formation 384 - 387) for two periods '30.01 - '33.12 and '34.01 - '39.9, while the Section has only one (formation 373), for the whole period of '30.01 - '39.10.

Additionally "Vickers E Mk.A", unit 638 seems not to be assigned to Poland in the Nation field.

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Can you explain me what's the point of having a basic rifle in a slot different then 1, like the Polish unit 284, as it's not multiplied by the number of men? I understand that everybody took their time with a rifle during shooting of slot 1.