mail merge word and excel

[bob_man_uk]

Hi all,

i have a slight problem, im trying to merge data from an Excel document into word the problem is when i try to query by area which should be RG (the query is AREA equals to RG) it fails to bring back the data, however if the area is equals to 631 or any number it brings it back ok, is there a reason as to why it would bring back number but not letter, the letter quesry brings up the error

word can not parse your query option into a valid SQL string

i have never come across this error before, any help is appreciated,

thanks in advance

MattyG