SQL HELP

Hi All,

I am trying to update a filed in file A based on a condition in file A and a
condition in file B using STRSQL.  Following is the statement that I am
using;

UPDATE NCTSF/"RNK.PCTG" SET pcvbch = 0 WHERE pcvbch <> 0
and (digits(PCYEAR) concat digits(PCSKEY)) in (SELECT (digits(PCYEAR
) concat digits(PCSKEY)) from NCTSF/"RNK.PPAR",  NCTSF/"RNK.PCTG"
WHERE PPYEAR = PCYEAR AND PPSKEY = PCSKEY AND PPROLL <> 'V')

It seems like it is trying to do the update, but the problem is that it just
keeps going and going like it has a cartesian join or something.  I have
about 13,000 records in each file and although file A has more that one
record that matchs file B,  file B is unique on these fields.  I am getting
a count 500,000 and it was still going.

We are using this on a box at V4R4.

Any suggestions what may be going on.

TIA
Ron