How to truncate fact tables using wb_truncate_table

Hi,
I've got a sequence of mappings that load various staging tables, dimensions and fact tables.
At present, I truncate the fact tables manually before loading the dimensions (to avoid foreigh key errors), but would like to write mappings to do the truncations.
I tried creating mappings using wb_truncate_table in a Pre-Mapping Process operator (using a constant for the filename), but can't figure out how to get this to actually truncate the fact table.
The manual says to "connect the output attribute of the Pre-Mapping Process operator to the input group of a target operator." However the PMP operator in my mapping doesn't have an output operator (and the add button is greyed out).
Sorry if I'm missing something obvious, but can anybody help, or advise on a better way to truncate my fact tables before reloading the dimensions?
Thanks in advance.
Chris

got that to work using WB_TRUNCATE_TABLE in a PMP in the first mapping to >populate one of the fact table's dimensions. The problem I was having was in >trying to create a mapping just to do the truncate, but I see now that's not the >way to go.If you want to create a mapping that just truncate some table(s) - it's very easy.
1. Just create your own function that returns, let's say, char. Inside this function, call WB_TRUNCATE_TABLE and return dummy char (e.g. '1'). Then create some dummy table with only one colum of char type.
2. Create mapping. place constant operator, your function as transformation operator, and dummy table. Link them CONSTANT - TRANSFORMATION - TABLE.
That's all. If you want to truncate more tables within one mapping, just add more FUNCTIONS and add more attributes (table names) to the constant operator.

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