1.As regards deliveries, controls shall be executed at farm level, during transport of the milk and at purchaser level. At all stages Member States shall physically check by means of on-the-spot checks the accuracy of registration and accounting of the milk marketed and in particular:
(a)at farm level, the status of producer within the meaning of Article 5(c) of Regulation (EC) No 1788/2003 as well as the compatibility between deliveries and production capacity;
(b)at transport level, the document referred to in Article 24(4) of this Regulation, the accuracy of the instruments for measuring milk volume and quality, the accuracy of the collection method, including possible intermediate collection points, the accuracy of quantity of collected milk at unloading;
(c)at purchaser level, the accuracy of declarations referred to in Article 8 of this Regulation, in particular by cross-checks to documents referred to in Article 24(2) to (5) of this Regulation as well as the credibility of the records of stocks and deliveries referred to in Article 24(2) and (3) of this Regulation in the light of the commercial documents and other documents showing how the milk collected has been used.