src/main/java/org/apache/sling/servlets/post/AbstractPostOperation.java [116:132]:
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            final Map<String, String> modificationSourcesContainingPostfix = new HashMap<>();
            final Set<String> allModificationSources = new HashSet<>(changes.size());
            for (final Modification modification : changes) {
                final String source = modification.getSource();
                if (source != null) {
                    allModificationSources.add(source);
                    final int atIndex = source.indexOf('@');
                    if (atIndex > 0) {
                        modificationSourcesContainingPostfix.put(source.substring(0, atIndex), source);
                    }
                }
            }

            // fail if any of the base paths (before the postfix) which had a postfix are contained in the modification set
            if (modificationSourcesContainingPostfix.size() > 0) {
                for (final Map.Entry<String, String> sourceToCheck : modificationSourcesContainingPostfix.entrySet()) {
                    if (allModificationSources.contains(sourceToCheck.getKey())) {
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src/main/java/org/apache/sling/servlets/post/impl/operations/AbstractPostOperation.java [119:135]:
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            final Map<String, String> modificationSourcesContainingPostfix = new HashMap<>();
            final Set<String> allModificationSources = new HashSet<>(changes.size());
            for (final Modification modification : changes) {
                final String source = modification.getSource();
                if (source != null) {
                    allModificationSources.add(source);
                    final int atIndex = source.indexOf('@');
                    if (atIndex > 0) {
                        modificationSourcesContainingPostfix.put(source.substring(0, atIndex), source);
                    }
                }
            }

            // fail if any of the base paths (before the postfix) which had a postfix are contained in the modification set
            if (modificationSourcesContainingPostfix.size() > 0) {
                for (final Map.Entry<String, String> sourceToCheck : modificationSourcesContainingPostfix.entrySet()) {
                    if (allModificationSources.contains(sourceToCheck.getKey())) {
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