Casting list of variant to record type invalid

Check the output of rule SJ_CM_getCustomerById(). If it is returning datasubset then you need to test using the dot operator like: 

rule!SJ_CM_getCustomerById(6).data

sallyjoyg0002 Please try this

a!queryRecordType(
recordType: 'recordType!ISJ_CM_Customer_Record',    /*(Your Record Type)*/
filters: a!queryFilter(
field: 'recordType!SJ_CM_Customer_Record.customerID',  /*(Your Record Type Field)*/
operator: "=",
value: ri!customerID   /*(Your rule input)*/
),
pagingInfo: a!pagingInfo(
startIndex: 1,
batchSize: 1
)
).data

Try with creating a new expression rule with Adding you record type with above shown example add record field and compare with rule input to follow above example and check again with using this rule.

Still the same problem.

Thank you that worked. Just a follow up question, i have a set of docu images in a folder but in my records, its contained in an integer variable (the folder id of the image). How do i retrieve the image in an interface?

thank you

Hello,

Below might be useful!

a!localVariables(
local!images_cdt: folder(ri!idOfFolder, "documentChildren"),
{
a!imageField(
images: a!forEach(
items: local!images_cdt,
expression: a!documentImage(document: fv!item)
)
),
/* OR */
a!richTextDisplayField(
value: a!forEach(
items: local!images_cdt,
expression: a!richTextImage(a!documentImage(document: fv!item))
)
)
}
)

Use this code in your display value of column field of your record where you see document id in integer

a!imageField(
images: a!documentImage(
document: fv!row[SJ_CM_Customer_Record.docImage],  /*(Your Record Type Field)*/
size: "SMALL")

There is still an error