Pathfinder: Cleric Domain Spell Slot

Question

Can I prepare a Lower leveled domain spell in a Higher leveled Domain spell slot?

Answer 1

If we combine the rules for preparing spells:

Spell Slots

The character class tables show how many spells of each level each can cast per day. These openings for daily spells are called spell slots. A spellcaster always has the option to fill a higher-level spell slot with a lower-level spell. A spellcaster who lacks a high enough ability score to cast spells that would otherwise be her due still gets the slots but must fill them with spells of lower levels.

( http://www.d20pfsrd.com/magic#TOC-Preparing-Divine-Spells )

With those for Domains:

A cleric gains one domain spell slot for each level of cleric spell she can cast, from 1st on up. Each day, a cleric can prepare one of the spells from her two domains in that slot.

Then it seems there is nothing preventing you from doing it. It says you always have the option to use a lower level spell, and domain spells are prepared just like any other.