What are the steps to reproduce your problem?
Deploy a bpmn process with an Id (Business Key) longer than 64 chars.
Try to set a specific authorization for this Business Key.

What is the problem?
ORA-12899: value too large for column "CAMUNDA"."ACT_RU_AUTHORIZATION"."RESOURCE_ID_" (actual: XXX, maximum: 64)

What would be the expected behavior:
Should also accept longer Resource IDs (for example 255 chars as the limitation of KEY_ in ACT_RE_PROCDEF is)

Hints (optional):
for Oracle (I didn't check other database DDLs):
– enlarge column resource_id_ to fit all process keys (remove index while update, Oracle won't accept it otherwise)
drop index ACT_UNIQ_AUTH_USER;
drop index ACT_UNIQ_AUTH_GROUP;
alter table ACT_RU_AUTHORIZATION modify RESOURCE_ID_ NVARCHAR2(255);
create unique index ACT_UNIQ_AUTH_USER on ACT_RU_AUTHORIZATION
(case when USER_ID_ is null then null else TYPE_ end,
case when USER_ID_ is null then null else RESOURCE_TYPE_ end,
case when USER_ID_ is null then null else RESOURCE_ID_ end,
case when USER_ID_ is null then null else USER_ID_ end);

create unique index ACT_UNIQ_AUTH_GROUP on ACT_RU_AUTHORIZATION
(case when GROUP_ID_ is null then null else TYPE_ end,
case when GROUP_ID_ is null then null else RESOURCE_TYPE_ end,
case when GROUP_ID_ is null then null else RESOURCE_ID_ end,
case when GROUP_ID_ is null then null else GROUP_ID_ end);

No urgent fix necessary, since we can run the statement already
But might help others...