As I pointed out, EU law says that if somebody has a passport of an EU member state, then they must be admitted.
You point out the conflict with Polish law.
In general the EU law must be implemented in this area.
But that does not mean that you might possibly have a problem at the border.
But if you ever do have a problem, having a very clear printout from Directive 2004/38/EC would help, and knowing your rights under EU law.
http://eumovement.wordpress.com/eu-coun ... fo-poland/ contains a link to some laws. The english translation does not seem to suggest they have made an exception to disallow entry if the person is also a Polish citizen:
ACT of 14 July 2006
on the entry into, residence in and exit from the Republic of Poland of nationals of the European Union Member States and their family members
(Journal of Laws No. 144, item 1043)
Article 2
Whenever in this Act the reference is made to:
(1) border – it shall signify the state border of the Republic of Poland within the meaning of the Act of 12 October 1990 on the protection of the state border (Dz.U. of 2005 No 226 item 1944);
(2) travel document – it shall signify a travel document within the meaning of the Act of 13 June 2003 on foreign nationals (Dz. U. of 2003, No 128, item 1175 as amended )
(3) Union citizen – it shall mean a foreign national:
(a) national of the European Union Member States,
(b) national of the non-EU European Economic Area states,
(c) national of States, which are not parties to the agreement on European Economic Area, who may exercise their right to move and reside freely within the territory on the grounds of the agreements concluded by these States with the European Community and its Member States;
Article 9
1. Union citizen may enter the territory of the Republic of Poland on the grounds of a valid travel document or other valid documents confirming their identity and citizenship.