Question: Literals and BVP DAEs

Hello, In C one can use the preprocessor to #define a string literal to be inserted elsewhere in the code. Is there a way to do something like this in Maple? I ask because I am defining a BVP that includes another function as part of the derivitive, and dsolve rejects this, saying that it can't handle a BVP differential algebraic equation (I dont know why it can't do it!). Inserting the expression in place of the reference to the function gives no problem. Thanks
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