Field is in DB table/alias but I get ORA904 error using it in OBIEE Answers

Hello, I'm very new at developing with RPD and OBIEE tools, so I'm struggling with something that I thought I did correctly. I added a new field to a database table, and can query it in the database. I added it to the table in RPD Physical layer and I verified that it also now exists in an alias of that table. The physical alias table field is used as a source for a logical column in the presentation layer. Everything looks good in the RPD. But when I try to pull it up in a query in OBIEE Answers I get a 904 error telling me that the column does not exist. I've bounced the servers, dropped cookies and cache, but nothing helps - I still get the error.
What step could I have missed?
Thanks in advance!
Rich

THank you all for the advice, but it still appears to be a problem. Here's what I tried and the results:
1. Right-clicked on the new column to do a row count update. As predicted by Gaurav, this also failed with a 904 error.
2. Verified exact spelling is correct.
3. Checked the connection pool. THis looks correct, but I will double-check today with one of my co-workers who has more experience with RPD.
4. Tried querying the column in RPD - this also failed with 904 error.
5. Checked the LTS within BMM layer and my new field does map back to the alias column
6. Ran a consistency check and the only errors (warnnings actually) are for a different, unrelated table.
7. Checked security and it also looks okay, but this is another one I'll double-check later with one of our experts here.
8. Joins in physical layer and BMM look good
9. Checked physical column and table in the presentation layer. These also point to the right columns/tables
10. Selecting the column by itself in analysis fails with 904.
If anyone can think of something else to consider based on this please advise. One thing I did notice is that in performing the steps above I noticed somewhere (the BMM I think) that the new column I added is at the bottom of the table (last field) and not in the middle as it is in the database. In past experience with other tools this hasn't mattered, but I'm going to see if I can change that and if that has an effect. I'm guessing it won't but I'm running out of ideas!
Thanks again,
Rich

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