SSIS Flat File Source not populating varchar column

Question

I have SSIS package that imports flat files with column separator | from "Flat File Source" into the database trough "OLE DB Destination".
For one of the columns (file contains UIDs in curly brackets) destination column is varchar(250) null-able, when "Retain nulls" is set to true complete data have been imported, but when "Retain nulls" is set to false beside fact that in
the file data is not null and it is not empty string it is not imported and in the destination column is empty string.
I know that this "Retain nulls" applies to the columns that contains NULLs but this is not the case.
If someone have experience with such issue please help.
Thank you in advance.

Answer 1

From your statement it looks like when you have curly brackets it skips the value and inserts nulls instead. And that may be the reason why its working fine when you change retain null value. 
I would suggest 
Make your setting "retain null" to true and load the flat file, then check what happens to the values having curly braces (is there any value or null) , if there is value we need to check for that(please share a sample file). And if it having null
instead of "{value}", I would suggest to put a script task to remove { from your flat file and then try load the data.
Hope this helps.
Regards, -Amit