  The reaction pp->p K0 pi+ Lambda has been studied with the ANKE spectrometer
at COSY-Juelich at a beam momentum of 3.65 GeV/c in order to search for a
possible signal of the pentaquark Theta+(1540), decaying into the p K0 system.
By detecting four charged particles in the final state, the K0 and the Lambda
have been reconstructed to tag strangeness production. It has been found that
the pi+ Lambda missing-mass spectrum displays no significant signal expected
from the Theta+(1540) excitation. The total cross section for the reaction
pp->p K0 pi+ Lambda has been deduced, as well as an upper limit for the Theta+
production cross section. The intermediate Delta++ K0 Lambda state is found to
provide a significant contribution to the reaction.
