Subledger Accounting / Financials Accounting Hub uses dynamic package to generate the journal entries.
Depending on the rules (AMB Setup and Event Model) the dynamic package will be created, when the Validate Application Accounting Definition program has been run.
The package will be generated with the naming convension XLA_{5DIGIT_APPL_ID}_AAD_{SEED_CUSTOM}_{6DIGIT_AAD_HASH}_PKG.
AAD_HASH value will be found in xla_product_rules_b.product_rule_hash_id.

If any of the dynamic packages is in error, first, try to run "Validate Application Accounting Definitions" program with the parameter "Uncompiled Status Only" as No.
If the program log / output is showing some Invalid AADs or still the package is in error, then check the errors in database.

SELECT *
FROM dba_errors
WHERE name LIKE '&dynmc_pkg_name';

Examples for errors:
PLS-00103: Encountered the symbol "THEN" when expecting one of the following:
PLS-00103: Encountered the symbol "NVL" when expecting one of the following:

This error may occur mainly due to two reasons:
a) Missing source, which is used in the setup.

SELECT xc.*
FROM xla_conditions xc
WHERE xc.application_id = &appl_id
AND xc.source_code IS NOT NULL
AND NOT EXISTS (SELECT 1
FROM xla_sources_b xsb
WHERE xc.source_application_id = xsb.application_id
AND xc.source_type_code = xsb.source_type_code
AND xc.source_code = xsb.source_code);

For (a), check any patch available in MOS for the missing source in JLT / ADR / JED conditions. Otherwise, contact Oracle Support.
For (b), check the conditions of the JLT / ADR / JED, whether anything is wrongly entered or not.
For Ex: AND / OR is missing in this JLT conditions.