  The presence of g- and p-modes allows testing stellar models from the core to
the envelope. Moreover, binarity in an eclipsing system constrains the physical
parameters of the pulsating star. CoRot ID 100866999 is a relatively
large-amplitude hybrid gDor - dSct star with two clearly distinct frequency
domains. The large number of detected frequencies allows a detailed study of
the interaction between them. In addition, we can derive the fundamental
parameters of both components from the study of the eclipsing light curve.
After removing the eclipsing phases, we analyzed the data with the Period04
package up to S/N=4. The light curve was then prewhitened with these
oscillation frequencies to derive the fundamental parameters of the two
components. The eclipsing light curve analysis results in a (1.8+1.1)\,Mo
system, both components being main sequence stars. We detect 124 frequencies
related to luminosity variations of the primary. They are present in two
well-separated domains: 89 frequencies in the interval [0.30;3.64]/d and 35 in
the interval [14.57; 33.96]/d. There are 22 gDor frequencies separated by a
constant period interval Delta P = 0.03493 d. These frequencies correspond to a
series of g-modes of degree ell=1 with successive radial orders k. We identify
21 linear combinations between the first nine gDor frequencies. The dSct domain
is dominated by a large-amplitude frequency F=16.9803 /d. The eight first gDor
frequencies f_i are present with much lower amplitude in the delta Scuti domain
as F +/- f_i. These interactions between g- and p-modes confirm the phenomenon
we detected in another CoRoT star. The amplitude and the phase of the main
frequency F shows a double-wave modulation along the orbital phase, giving rise
to series of combination frequencies. Such combination frequencies are also
detected, with lower amplitude, for the first gDor modes.
