Error "que_DATA: Data is available" when deleting a named post queue (4330829)

The deleteq command in qview is supposed to get rid of the queue structure along with the data in the queue. At times it errors out with "que_DATA: Data is available". The following is a sample session:

qview> qsetup

qview> list

The following queues exist:

csgpfia1+P+o.DBOPFIA1-o.DBOPFIA3

subqueues range from 0 to 13

WRITER +PI+csgpfia1+sp_mport+0x91e4cdc9 (145.228.205.201)

READER +PP+csgpfia1+sp_opst_mt+o.DBOPFIA1-o.DBOPFIA3

csgpfia1+P+o.DBOPFIA1-o.DBOPFIA2

subqueues range from 2 to 6

WRITER +PI+csgpfia1+sp_mport+0x91e4cdc9 (145.228.205.201)

READER +PP+csgpfia1+sp_opst_mt+o.DBOPFIA1-o.DBOPFIA2

qview> deleteq p csgpfia1+P+o.DBOPFIA1-o.DBOPFIA2

Queue csgpfia1+P+o.DBOPFIA1-o.DBOPFIA3 (y/n) <n>? n

Queue csgpfia1+P+o.DBOPFIA1-o.DBOPFIA2 (y/n) <n>? y

Error deleting queue csgpfia1+P+o.DBOPFIA1-o.DBOPFIA2

que_DATA: Data is available

qview> exit