sql insert data match error

need help,
my brain.. ###########
my brain on fridays...&%&$())#*#&!!!
cannot resolve this insert error,
(loading a file from HR master)
its always the simple one's that stomp on you...LOL

ps..I checked the midrange archives, but the responses
there only dealt with a conversion of the CCSID,
not file data fields.

PF (FILE1) dds
A lastname 17A
A yrsworked 3S 0

PF (HRMAST) dds
A LASTNAM 20A
A YRSSERVC 3P 1

intention,
to merely extract years worked as a
whole integer into another file.

sql:

INSERT INTO FILE1
SELECT
SUBSTR(LASTNAM,1,17),
CASE WHEN YRSSERVC > 0.99
THEN DEC(YRSSERVC,3,0)
ELSE DEC(0,3,0) END

messages:

Message . . . . : Comparison of selection operands may never be equal.

Cause . . . . . : The digits, decimal positions, or length of the field
operand have been increased so that it may be properly compared with one or
more literal operands. Therefore, the field operand may never equal the
literal operand.






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