pdblp: bulkref start date override

Question

I'm trying to query release dates for a ticker using pdblp. This is my attempt:

with pdblp.bopen() as c:
    c.bulkref('AUM3 Index', 'ECO_RELEASE_DT_LIST')

But the results I'm getting are between Jan 2019 and Dec 2020. How can I get information about release dates further back? I've tried to override the start date but none of the attempts succeeded:

ovrds=[('start_dt', '20000101')]
ovrds=[('start_date', '20000101')]
ovrds=[('START_DATE', '20000101')]

I've also tried:
c.bdh('AUM3 Index', 'ECO_RELEASE_DT', '20000101', '20200609')

But this one generates no results at all.

The live Bloomberg help doesn't support Python API.

Answer 1

Assuming your bds is:

=BDS("AUM3 Index", "ECO_RELEASE_DT_LIST", "START_DATE=20000101")

You could try something like this:

c.ref(["AUM3 Index"], "ECO_RELEASE_DT_LIST", [("START_DATE","20000101"),])

Reference: https://github.com/matthewgilbert/pdblp/issues/25