This is going to be one of those dot points that will be explained by the examination comittee when the marking scheme is devised.
What people have said above is what most of the study guides have decided is the answer.
A couple of references
http://www.aip.org/history/einstein/public3.htm
http://www.sparknotes.com/biography/planck/
http://www.sparknotes.com/biography/einstein/
A few other points.
Planck was one of the founders and promotors of the German Science Societies that was set up to promote scientific research and Genrman nationalism. They were also set up to drag in funding from industry, politics and other sources. He would offer large packages to enlist scientists that could promote these goals.
Einstein accepted one of these packages but saw himself as a whore for money by working for Universities.
Planck was willing to appease to pressure of acceptance as he told Einstein and to head in the direction of acceptance for scientific research that Einstein ignored.
"As an older friend, I must advise against it....In the first place, you won't succeed and even if you do, no one will believe you"
In reference to the manifesto in WW1, Einstein saw ignorance as no excuse. He said
"Inunumerably often, in these gloomy years of general nationalisitic blindness, men of science and arts have made public declerations which have already unmeasurably damaged feelings of solidarity among those who are devoting themselves to higher and freer goals"
This shows what he thought of the importance of global cooperation for scientific reseach and while nationalism should not come into against Plancks view. Although Planck later was one of the pushers to bring Germany back into the international scienctifc community.
During the first world war he protested within the Academy about the direction of research, while Planck was happy to follow the directions of the government.
I am trying to come up with a more thorough answer but probably won't have it finished to some time in the holidays.