I don't know PROC CALIS well enough to provide you with a good answer.
Maybe @CatTruxillo can help you if you insist on using PROC CALIS.
I'm just replying to tell you about other SAS/STAT procedures for Causal Inference.
( taken from Usage Note 30333: FASTats: Frequently Asked-For Statistics
https://support.sas.com/kb/30/333.html )
Causal analysis
- Beginning in SAS 9.4M4, SAS/STAT PROC CAUSALTRT estimates the average causal effect of a binary treatment variable on a continuous or discrete outcome. It can adjust for confounding by modeling the treatment assignment or the outcome or both.
- Beginning in SAS® 9.4M5 (TS1M5), SAS/STAT PROC CAUSALMED estimates causal mediation effects from observational data.
- Beginning in SAS Studio 3.6, the Causal Models task.
- Beginning in SAS Viya 2023.09, PROC CAEFFECT implements model-agnostic estimation methods to adjust for confounding variables when studying the causal effect of a treatment variable on an outcome.
BR, Koen