If I understand this correctly, you have a BP with a data picker that points to another record of the same BP. BP1 record 1 points to BP1 record 2.
Then you auto-create a record of BP2 and want it to also point to BP1 record 2.
If that is the case, you try auto-populating the data picker from the auto--creating record. You may need 2 data pickers: 1 to point to the auto-creating record, and the other to auto-populate from the data picker on the auto-creating record.
I tried auto populating the value in another data picker, but record number is not populating.
Can you please suggest.
I am confused. You have 2 BPs (BP1 and BP2). BP1 auto-creates BP2. On BP2, you want to see the record number of BP1? If so, you can use a BP Picker on BP2, create a reference process and select the display field to be the record number. It will auto-populate in the BP Picker field. If you need a separate field to hold the record number, create a 2nd DE based on record number and auto-populate it from the BP Picker reference.