THE OPEN March beans:  9 1/4 higher March meal:  2.50 higher March soyoil:  13 higher March corn;  2 1/2 higher March wheat:  2 1/4 higher Prices opened with an air of caution and quickly filled in small open PM session gaps.  Headlines continue to be digested with China confirming the phase one trade deal.  However, skepticism seems to be invasive across the board as the subject of potential Chinese buying activities for US goods remains largely unclear.   While the President stated that China would commit to buying $40-$50 bln of US Ag products, the Chinese seemed to balk at committing to a US dollar figure, instead saying the purchases needed to be based on domestic demand, under stress...