'IEX: Send Dunning for Delinquent Customers' request NO DATA found

IEX: Send Dunning for Delinquent Customers fails with "unexpect exception" throughout the logfile.

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Start of log messages from FND_FILE

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SEND_DUNNING_CONCUR dunning_plan_id = 10020

CORRESPONDENCE DATE         : 2015/12/04 00:00:00

PARENT REQUEST ID           :

DUNNING MODE                : DRAFT

SINGLE STAGED LETTER        : N

PROCESS ERRORED RECORD ONLY :

NUMBER OF WORKERS           : 1

CUSTOMER NAME LOW           :

CUSTOMER NAME HIGH          :

ACCOUNT NUMBER LOW : 1170

ACCOUNT NUMBER HIGH : 1170

BILLTO LOCATION LOW :

BILLTO LOCATION HIGH :

Order Output Letters By : LOCATION

DESTINATION PRINTER :

Org Id:82

l_running_level : ACCOUNT

l_business_level : ACCOUNT

define_ou_running_level : N

collections_methods : DUNNING

Dunning Running Level=ACCOUNT

Dunning Aging Bucket=2

Start Send_Dunning