$3\mathrm{.}5.$ Step $5$ of the logical design phase involves mapping ternary relations $($see page $187).$

Examine the ternary relationship between the entities HOM, POS$\_$DEVICE and

SHIFT$\_$ALLOCATION as illustrated in the simplified ERD below.

$3\mathrm{.}5\mathrm{.}1.$ Formulate the business rules that underpin the ternary relationship.

$(32)=(6)$