Very common problem occurs in Forms is  

"FRM-40654: Record has been updated by another user. Re-query to see change"

Cause:  Another user has updated this record since you performed a query and has changed at least one field in the record. Your actions have not changed the record in memory.

Action:  You can update or delete this record now only if another user has restored the field values back to the way they were when you performed the query. Otherwise, you must re-query to fetch and display the new record into the form before you can update or delete it.

This is very common issue after migration or with any external interfaces, If you have taken care by TRIM function , then there is nothing to bother, else your end user will report this, which need a proper investigation.

Reason & Resolution

This error is caused because of any of the following

1. FRM-40654 Caused by unnecessary foreign key fields
   
   
2. Trapping problem of some sort in Oracle Forms with triggers, execute_query
   
   
3. Record locked ie Another user changed the record and saved after you queried the record
   
   
4. Some of the columns have trailing spaces, and Forms by default truncates the trailing spaces and hence the database value and form value will not match and you get the error.
   
   
5. Date field stored in database is with time stamp but form showing only Date component and hence Form value and database value will not match and hence you get the error.
   (you need to remove the time component in DB or show date time in Form)
   

Bottom line is the value in Database and value in form are not matching, so you have to check for each column and see where is the difference.
I know this is going to be painful checking out every field for changes, but there is no other options left.

What you have to do is to investigate the column first and then make a update with TRIM function as

update <table name>
set <column name> = trim(<column name>);

Resolutions Example

Example 1

User reported the problem at suppliers site,

• Taking which table hold the supplier data.
  
  
• Check a column value for a VARCHAR2 column. In this case VENDOR_SITE_CODE. or Address_line1
  SELECT '['||vendor_site_code||']'
  FROM po_vendor_sites_all
  WHERE vendor_id=<VENDOR ID>;
  
  
• Once you get the column , then use update script, with TRIM function, like
  
  
• UPDATE po_vendor_sites
  SET vendor_site_code = TRIM(vendor_site_code)
  WHERE vendor_id = <VENDOR ID>;
  

Example 2

Your bank statement Reconcile program ending up with error

In similar way you have to check like

1. select '['||trx_text||']' from ce_statement_lines_interface;
2. select '['||trx_text||']' from ce_statement_lines;

The above mentioned scripts need to be run against all varchar2 columns, not just trx_text, in either ce_statement_lines or ce_statement_lines_interface.

If trailing spaces are found, run the following scripts to correct them:

update ce_statement_lines_interface
set trx_text=trim(trx_text,' ')

Change the column and table name to those with trailing spaces

Example 3

Invoice Through Auto invoice (External system)

Same way to find the column and apply by this kind of script
update ra_customer_trx_lines_all
set DESCRIPTION = trim(DESCRIPTION) ,
SALES_ORDER = trim(SALES_ORDER)
where customer_trx_id = <customer trx id>;

What if , not have "trailing space" Problem

Confirm with DBA , is table is having any lock or not . If still the problem exists raise SR and apply the script provided.

Tips of Developing Conversion and Interface

Always use TRIM function in your insert statement of the program