  In recent electron-positron angular correlation measurements the observed
significant enhancements relative to the internal pair creation at large angles
was interpreted as indication of the creation of $J^{\pi }=1^{+}$ boson called
X17 particle. In this paper it is brought up that such enhancements can be
generated by higher order processes. It is found that nuclear transitions, the
transition energy of which is significantly lower than the whole transition
energy, can cause peaked angle dependence in electron-positron angular
correlation.
