  We discuss the electroproduction of pseudoscalar ($0^{-+}$) or scalar
($0^{++}$) meson production off the scalar target. The most general formulation
of the differential cross section for the $0^{-+}$ or $0^{++}$ meson production
process involves only one or two hadronic form factors, respectively, on a
scalar target. The Rosenbluth-type separation of the differential cross section
provides the explicit relation between the hadronic form factors and the
different parts of the differential cross section in a completely
model-independent manner. The absence of the beam spin asymmetry for the
pseudoscalar meson production provides a benchmark for the experimental data
analysis. The measurement of the beam spin asymmetry for the scalar meson
production may also provide a unique opportunity not only to explore the
imaginary part of the hadronic amplitude in the general formulation but also to
examine the significance of the chiral-odd generalized parton distribution
(GPD) contribution in the leading-twist GPD formulation.
