is there any provision of extending the validity period of quotation

hi,

sap gurus,

good evening,

is there any provision of extending the validity period of quotation

for eg:

my quotation is created with a validity period of 01:06:2008 to 30:06:2008

is there any provision of extending the validity period of quotation

if its possible

plz let me know

regards,

balaji.t

09990019711