Strange error message with 7.0beta1

When trying to load my data from a 6.5 pg_dump, I got the error message:

psql:/tmp/ati-tmp.sql:87: ERROR: Tuple is too big: size 8164, max size
8140

I trimmed back the dump file to a minimum of these commands that will
still generate the error:

CREATE TABLE "exp_log" (
"expnum" text,
"amount" float8,
"tdate" date,
"toid" int4,
"pdto" text,
"memo" text,
"status" character varying(2),
"etype" character varying(1),
"glid" int4,
"blink" int4);
CREATE TABLE "whold_log" (
"expnum" text,
"gross" float8,
"fed" float8,
"ssec" float8,
"mcare" float8,
"state" float8,
"garn" float8,
"med" float8,
"dent" float8,
"w125" float8,
"w401k" float8,
"eic" float8,
"other" float8,
"othacc" character varying,
"cost" float8,
"allow" int4,
"taxstate" character varying(4));
CREATE TABLE "payroll_log" (
"expnum" text,
"amount" float8,
"tdate" date,
"empl_id" int4,
"pdto" text,
"memo" text,
"status" character varying(2),
"glid" int4,
"gross" float8,
"fed" float8,
"ssec" float8,
"mcare" float8,
"state" float8,
"garn" float8,
"med" float8,
"dent" float8,
"w125" float8,
"w401k" float8,
"eic" float8,
"other" float8,
"othacc" character varying,
"cost" float8,
"allow" int4,
"taxstate" character varying(4));
CREATE RULE "_RETpayroll_log" AS
ON SELECT TO "payroll_log"
DO INSTEAD
SELECT "e"."expnum",
"e"."amount",
"e"."tdate",
"e"."toid" AS "empl_id",
"e"."pdto",
"e"."memo",
"e"."status",
"e"."glid",
"w"."gross",
"w"."fed",
"w"."ssec",
"w"."mcare",
"w"."state",
"w"."garn",
"w"."med",
"w"."dent",
"w"."w125",
"w"."w401k",
"w"."eic",
"w"."other",
"w"."othacc",
"w"."cost",
"w"."allow",
"w"."taxstate"
FROM "exp_log" "e", "whold_log" "w"
WHERE ("e"."etype" = 'p'::"varchar")
AND ("e"."expnum" = "w"."expnum");

As the SQL was generated by a previous copy of PostgreSQL, I figured it
might be a problem with the 7.0beta1.

Any ideas?