requisitor

from The Century Dictionary.

• noun One who makes requisition; specifically, one empowered by a requisition to investigate facts.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who makes reqisition; esp., one authorized by a requisition to investigate facts.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who makes requisition; especially, one authorized by a requisition to investigate facts.