Question 4 Replies 448 Views × Close popover Avinash Haridasu (Avinash.Haridasu) Morgan Stanley Morgan Stanley IN View Profile Send Message Avinash.Haridasu Member since 2014 285 posts Morgan Stanley Posted: August 4, 2016 Last activity: August 5, 2016 Posted: 4 Aug 2016 3:34 EDT Last activity: 5 Aug 2016 7:26 EDT Closed ISSUE: Forward chaining of declare expression using a property from DP I 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 popover Facebook Twitter Linkedin Email Copy Link Copied! Moderation Team has archived post, learn more × Close popover 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 ago Posted: 4 Aug 2016 4:04 EDT × Close popover Gisela Rodrigues (rodrg) PEGA Technical Lead, Global Client Support Pegasystems Inc. IN View Profile Send Message rodrg PEGA replied to Avinash.Haridasu Hi 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 ago Posted: 4 Aug 2016 8:54 EDT × Close popover Prudhvi Ranjan Nallam (Prudhvi_N) PEGA Technical Solutions Engineer Pega IN View Profile Send Message Prudhvi_N PEGA replied to Avinash.Haridasu Hi 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 ago Posted: 4 Aug 2016 20:00 EDT × Close popover Joel McLeish (JoelMcLeish) PEGA Director, Service Assurance Pegasystems Inc. AU View Profile Send Message JoelMcLeish PEGA replied to Avinash.Haridasu You 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 ago Posted: 5 Aug 2016 7:26 EDT × Close popover Avinash Haridasu (Avinash.Haridasu) Morgan Stanley Morgan Stanley IN View Profile Send Message Avinash.Haridasu Morgan Stanley replied to Avinash.Haridasu Declare 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?