  Let $ACG(2\nu,\mathbb{F}_q)$ be the $2\nu$-dimensional classical affine space
with parameter $e$ over a $q$-element finite field $\mathbb{F}_q$, and ${\cal
O}_{\nu}$ be the set of all maximal totally isotropic flats in
$ACG(2\nu,\mathbb{F}_q)$. In this paper, we discuss Cameron-Liebler sets in
${\cal O}_{\nu}$, obtain several equivalent definitions and present some
classification results.
