The target for a numeric operation is too small to hold the result.

I have a question on this that is confusing for me. I have a value in a 
character field that is defined as 13 long. This field holds a numeric value 
that converts into a 13,4 decimal value. Here is what is in the variables:

Host field - REC_ENTERED_RECIEVED_QUANTITY = '0001023000000'
Receiving field - DMRLENRCQT = 000005760.0000 (Note this isn't cleared 
between writes so there is the value from the previous write in the value)

Here is my code:
dmrlenrcqt = %dec(Rec_Entered_Recieved_Quantity:13:4);

Is there anything obviously wrong here? If there is, I am not seeing it. 
More than likely I am misunderstanding how %dec works.