Error loading data with COPY

I am in the prototyping phase of a conversion from dbase to postgresql

I am trying to load data with the copy function,-------

*ham-existing=# \copy invst from '/home/fmwdba/transcoma' using
delimiters ','

I then get the following error --------

ERROR: value too long for type character(7)
CONTEXT: COPY invst, line 1, column stknum: "'0020338'"
ham-existing=#*

however, if I use the insert command and give the field names the data
will load. Can anyone see what I am doing wrong? I need to use the
copy function as I have a lot of data to load.

This is how I created the table
CREATE TABLE Invst (
STKNUM CHAR(7) NOT NULL,
RATIO NUMERIC(4,1),
PUBLET_ CHAR(1),
SORTNUM CHAR(1),
BINNUM CHAR(4),
BIN2 CHAR(4),
WEIGHT NUMERIC(5,2),
MUSICCDSLS NUMERIC(4),
AZTOOHIGH CHAR(1),
AZMAXPRICE NUMERIC(7,2),
OVERSIZE CHAR(1),
KEEPOFFWEB CHAR(1),
NEWSTKNUM CHAR(7),
ROLL_NUM NUMERIC(1),
DATEONAZ DATE,
AZCURINV NUMERIC(3)
);

CREATE UNIQUE INDEX XPKInvst ON Invst
(
STKNUM
);

ALTER TABLE Invst
ADD PRIMARY KEY (STKNUM);