How to create a dynamic path for Overflow Files?

Hi all Experts,

I´m trying to combine a variable with a string in the field "File name" from Error handling on a Target table. I´ve tried a lot of combinations, until now, unsuccessfully.

Example of what i need: "[$gv_Overflow_Directory]/Target_TABLE_NAME.txt"

But when i put only a variable like $gv_Overflow_File, it succeeds. The logic is below:

"$gv_Overflow_Directory = 'X:/Business Objects/BusinessObjects Data Services/log/OverflowFiles/';"

"$gv_Overflow_File = $gv_Overflow_Directory || $gv_Job_Name || $gv_Time_Stamp ||'.txt';"

Is there a way to achieve this concatenation?

Regards,

Fernando

p.s.: SAP BODS 12.2.2.3