[amelia] Amelia Error Code 32

Hello, I have a question about an error code, and whether or not there are options for working around it. Here is the situation: I have 4 variables (actually 4 classes of variables) that are linear combinations of each other. Thus, they all cannot be in the imputation model. I am using the "idvars" argument to hold one of these variables out of the imputation process to avoid the "error: inv_sympd(): matrix appears to be singular" message, which I think is related to the fact that these variables are related. However, when I try to hold one of these variables out of the imputations using the "idvars" argument, I get the message below: Amelia Error Code: 32 Transfomations must be mutually exclusive, so one variable can only be assigned one transformation. You have the same variable designated for two transformations. I have been able to get the imputations to run with the following: 1.) Running the imputation with only 3 of 4 the variables 2.) Running the imputation with 3 of the variables included in the imputation, but one left out using "idvars", and specifying incheck=FALSE Also, the "idvars" argument works just fine when I hold out two ID variables from the imputation...so it is only failing when I also add one of these 4 correlated variables. The 4 variables I am speaking of are not necessarily important for the imputation process, but are important for the stats I would like to run down the road on the imputed data (thus I need them in the final imputed data set). When I put all 4 of the variables into the "idvars" argument, I get the error related to the number of excluded variables >> number of variables used for imputation. Any advice on how to handle this problem is greatly appreciated! Thank you! All the best regards, Ryan