[rules-dev] can't put the formula in Guvnor 5.4

Hi Team ! Since yesterday only I started learning Drools with the help of Google and *JBOSS DROOLS BUSINESS RULES pdf file*. I faced many problems to understand the concept but now its going smooth. But the problem is the *version of PDF file of the book* and the *Govener version*. *Its quite different*. I request you all to please provide me the latest version of PDF as I am unable to find on net. The problem I am facing is to put the formula as given in the screen shot in the book. I am unable to put the *formula* as described in JBOSS DROOLS BUSINESS RULES pdf file on page no. 102.....the formula is *salesValue-10 as the box is not capable of taking cahracters. *It is taking only integer. Thanks in Advance for all the help and material !!!!