FuncPtg stores 2 bytes of data where AbstractFuncPtg says it is 4 bytes long. Store the other 2 bytes when reading an excel file so that the "Warning: Data may have been lost" prompt is avoided after serialization.
jakarta/poi/trunk/src/java/org/apache/poi/hssf/record/formula/FuncPtg.java
jakarta/poi/trunk/src/testcases/org/apache/poi/hssf/record/formula/