We report on the scaling of transport properties around the vortex melting
in YBa2Cu3O7-delta oriented-twin single crystals in applied magnetic fields
between 1 T and 18 T. We find that for the whole measured field range the
linear resistivity scales as rho (t, theta)similar tot(sy) F+/- (sin(theta
)t(-sx)), with t= \T-T-BG\ and theta the angle between planar defects and t
he magnetic field. The scaling is valid only for angles where the transitio
n temperature T-BG(theta) shows a cusp. The critical exponents sx and sy ar
e in agreement with the values predicted by Lidmar and Wallin [Europhys. Le
tt. 47, 494 (1999)] only at magnetic fields below 4 T. A change in the valu
e of sx from sx= 1 +/-0.2 to sx= 3 +/-0.2 at around H(cr)approximate to4 T
when the magnetic field is increased is responsible for changes in the shap
e of the T-BG(theta) curve and in the dependence of the linear dissipation
on temperature and angle. The results strongly suggest the existence of a d
ifferent vortex glassy phase in twinned crystals compared to the Bose-glass
state found in samples with linear defects.