Supplier Quotation status 'Stopped'


I wanna ask about Supplier Quotation Status.
I found that in code there’s a field named status in doctype Supplier Quotation which has ‘Stopped’ as one possible value
I found that in some part, it was used as a validation. But I never found which code set that ‘status’ into ‘Stopped’.

Does anyone know how to set it to ‘Stopped’ value?
Thanks in advance