Dear Omar Bautista:
You must have defined an identifier to be unique in File A, and the same variable as unique in File B. Let's say in file A, these are the records
id age A 34 B 40 C 21
In File B you have these:
id age B 45 D 56 E 18
In each of the files, "id" is unique, so no error message, but if you append the two you have a duplicate "id" (B), thus non-unique and resulting in an error message.
Regards,
Hans
On 10-Apr-19 01:08, EpiData development and support wrote:
Hello Jens and EpiData users!
I trying to append some EpiData files. But I'm having a problem... I tried the same steps that are illustrated in this video:
https://www.youtube.com/watch?v=BY6nZ0-k2Bs
But I'm having an error that is shown in the attached file.
Please, help me!