FYI, RAKUTENTRADE platform doesn't allow u to have both buying and selling of the same counter, if either one is still pending (which means to say; if u have a sell order for example:- PTGTIN 100,000@0.330; u would not be allow to have another buy order at say, buy PTGTIN 50,000@0.310)
the logic is to prevent manipulation. why KENTRADE which is much larger can allow it?
beware of this restriction!!!