Question4Replies432Views Avinash.Haridasu Member since 2014 259 posts Morgan Stanley Posted: 4 years agoLast activity: 4 years 1 month ago Closed ISSUE: Forward chaining of declare expression using a property from DPI have a datapage with source as RD to retrieve data from the table. I have an external table which has date of birth column. My requirement is to calculate age based on the date of birth.I have written a declare expression to calulate the age, However when the DP is executed the declare expression is not getting triggered.Any thoughts? Low-Code App Development Case Management ×Close popoverFacebookTwitterLinkedinEmail Copy Link Copied! Moderation Team has archived post This thread is closed to future replies. Content and links will no longer be updated. If you have the same/similar Question, please write a new Question. Posted: 4 years agorodrg PEGA replied to Avinash.HaridasuHi Avinash, Could you let me know which option you selected for Target Property Data calculate value unde the Change Tracking tab of the declare expression? Do you still face the same issue when you select the option "Whenever used"? Thanks, Gisela Posted: 4 years agoPrudhvi_N PEGA replied to Avinash.HaridasuHi Avinash, Can you please provide screenshots of the declare expression for better understanding to us. Ideally, your issue get resolved on keeping change tracking option to "Whenever used". Thanks and Regards, Prudhvi Ranjan. Posted: 4 years agoJoelMcLeish PEGA replied to Avinash.HaridasuYou may be hitting an issue with Read Only Data Pages, as it suggests these are read only post-load; what this doesn't clearly spell out that this includes declaratives on the data page. I have found by referencing them during the data page loading, they will fire. I usually have a Data-Transform called LoadDeclaratives which does a Property-Set of some arbitrary Param to the value of each declarative. Posted: 4 years agoAvinash.Haridasu Morgan Stanley replied to Avinash.HaridasuDeclare expression has calculate value as whenever inputs change. I have a readonly datapage sourced from RD which returns Date of brith. Am i facing issue because of the DP being readonly?