Error while altering a table in Oracle Portal

i have a table with primary key. i realize that the primary is not required and when i get rid of primary key thru Oracle Portal and say OK ... i am encountered with the following error -
Error:
ORA-25150: ALTERING of extent parameters not
permitted (WWV-11230)
Failed to parse as PORTAL30 - alter table
BPSITEST.JEN_TEST_PRIMARY_KEYS
drop PRIMARY KEY
modify(
EMP_ID NUMBER(10),
LAST_NAME VARCHAR2(10),
FIRST_NAME VARCHAR2(10))
PCTFREE 10
PCTUSED 40
INITRANS 1
MAXTRANS 255
STORAGE (
NEXT 256K
MINEXTENTS 1
MAXEXTENTS 2147483645
PCTINCREASE 0
ENABLE CONSTRAINT SYS_C003038 ENABLE CONSTRAINT
SYS_C003039 ENABLE CONSTRAINT SYS_C003040
(WWV-08300)
Any Ideas .... anyone ... ??
thanx
null

ORA-00054: resource busy and acquire with NOWAIT specified The table is currently in use by something else.
Werner

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