How to populate Salesforce Lookup Fields on a Standard Page Using URL Parameters

Question

While navigating to a standard page from custom page - I am passing URL Parameters to fields on the Standard page.

I am using fieldID to achieve this and it works for all fields except for lookup fields.

As mentioned in this blog, lookup field can be populated based on ID and Value. I am passing both ID and values.

Below is the snippet of my URL value:

/500/e?
00Na000000ArhgS=SampleProd
&CF00Na000000ArhgS_lkid=a7Za0000000PB6eEAG
&nooverride=1

For some reason, this does not populate the values in the lookup field. It should populate as "SampleProd"

Answer 1

Looking at a similiar url hack in my org, everything checks out, except for one thing, a missing prefix which causes the two ids to be different:

00Na000000ArhgS
CF00Na000000ArhgS_lkid

Try changing 00Na000000ArhgS to CF00Na000000ArhgS. Should do the trick.