Looking for an attribute in bw 7.3

Hi,

I have an infocube with the 0mat_plant infoobject and a ztest6ch infoobject in the characteristics, between others. ztest is the result of taking the first 6 characters of the ztest infoobject. ztest is an attribute of 0mat_plant.

In the update rule of that infocube I have the source for zthest6ch as Initial but I need to create a routine which take the 6 first characters of 0mat_plant-ztest.

My question is, how do I restore to the ztest attribute of 0mat-plant in the routine?

Thanks a lot in advance.

Regards.